Additional Investigation Report for a Second Bridge Across the Ashburton River

Transcription

1 Additinal Investigatin Reprt fr a Secnd Bridge Acrss the Ashburtn River Cntract C554

2 Reprt Additinal Investigatins fr a Secnd Bridge Acrss the Ashburtn River Cntract C554 Prepared By Bill Rice Principal Transprtatin Engineer Opus Internatinal Cnsultants Limited Christchurch Office 20 Mrhuse Avenue PO Bx 1482, Christchurch Mail Centre, Christchurch 8140, New Zealand Reviewed By Telephne: J Chang Facsimile: Senir Transprtatin Planner Date: February 2011 Reference: Status: Final Reviewed and Apprved fr Release By Simn Rbertsn, Civil Engineering Manager Opus Internatinal Cnsultants Limited 2010

3 Header Cntents 1 Executive Summary Intrductin Backgrund... 3 Ashburtn Transprtatin Study... 3 Secnd Bridge Issues and Optins Reprt... 3 Cnsultatin n the Optins identified in the Issues and Optins Reprt Methdlgy... 6 Scial Impact Assessment... 6 Cmmunity Reference Grup... 6 Cnsideratin f Feedback frm Previus Cnsultatin... 6 Getechnical Study... 7 Discussins with NZTA... 7 Preliminary Design... 9 Cst Estimates... 9 Traffic Mdelling... 9 Optin Assessment... 9 Priritisatin f Transprtatin Study Prjects Tinwald Schl Lcal Traffic n Existing Bridge Optins Optin Assessment Effects n Heritage Values Effects n Cultural Values Effects n Eclgical Values Effects n Hydraulic Capacity Cnstructin Related Effects Outer Bypass Fairtn t Winslw Descriptin Design Standards Rugh Order f Cst Estimate Traffic Effects Rad Safety Amenity Effects Prperty Effects Relatinship t Other Transprtatin Study Prjects Cmments / Ntes Inner Bypass- Seafield Rad t Laings Rad Descriptin Design Standards Rugh Order f Cst Estimate Traffic Effects Rad Safety Amenity Effects Prperty Effects Relatinship t Other Transprtatin Study Prjects Cmments / Ntes... 25

4 Header 10 Chalmers Avenue t east f Tinwald (Rural) Descriptin Design Standards Rugh Order f Cst Estimate Traffic Effects Rad Safety Effects n Schls Effects n Prpsed Riverview Retirement Village Amenity Effects Prperty Effects Relatinship t Other Transprtatin Study Prjects Cmments / Ntes Chalmers Avenue t east f Tinwald (Urban) Descriptin Design Standards Rugh Order f Cst Estimate Traffic Effects Rad Safety Effects n Schls Effects n Prpsed Riverview Retirement Village Amenity Effects Prperty Effects Relatinship t Other Transprtatin Study Prjects Cmments / Ntes Chalmers Avenue t Grve Street Descriptin Design Standards Rugh Order f Cst Estimate Traffic Effects Effects n Prpsed Riverview Retirement Village Amenity Effects Prperty Effects Relatinship t Other Transprtatin Study Prjects Cmments / Ntes West Street t Melcmbe Street (rail level crssing) Descriptin Design Standards Rugh Order f Cst Estimate Traffic Effects Rad Safety Amenity Effects Prperty Effects Cmments / Ntes West Street t Melcmbe Street (rail verpass) Descriptin Design Standards Rugh Order f Cst Estimate... 56

5 Header Traffic Effects Amenity Effects Prperty Effects Cmments / Ntes Laning f State Highway Descriptin Design Standards Rugh Order f Cst Estimate Traffic Effects Rad Safety Effects n Schls Amenity Effects Prperty Effects Cmments / Ntes Traffic Signals in Tinwald Descriptin Design Standards Rugh Order f Cst Estimate Traffic Effects Amenity Effects Prperty Effects Cmments / Ntes Cmparative Optin Assessment Criteria Assessment Assessment Summary Public Cnsultatin Likely Unlikely Recmmendatins... 71

6 APPENDICES APPENDIX A Ashburtn Street Map APPENDIX B Getechnical Investigatin Results APPENDIX C Traffic Cunt Data APPENDIX D Preliminary Grve Street Acustic Assessment APPENDIX E Optin Drawings (bund separately) APPENDIX F Optin Assessment (bund separately) Glssary f Abbreviatins The fllwing abbreviatins are used in this dcument: ADC Ashburtn District Cuncil BCR Benefit Cst Rati CO2 Carbn Dixide emissins CRLS Canterbury Reginal Landscape study GPS Gvernment Plicy Statement HCM Highway Capacity Manual LGA Lcal Gvernment Act LTCCP Lng Term Cuncil Cmmunity Plan LTMA Land Transprt Management Act LTNZ Land Transprt New Zealand NZTA New Zealand Transprt Agency NZTS New Zealand Transprtatin Strategy RLTS Reginal Land Transprt Strategy RMA Resurce Management Act SH 1 State Highway 1 SH 77 State Highway 77 SIMT Suth Island Main Trunk railway

7 Executive Summary 1 Executive Summary Opus Internatinal Cnsultants Ltd (Opus) has been cmmissined by Ashburtn District Cuncil (ADC) t undertake a technical investigatin fr a secnd bridge acrss the Ashburtn River fr the purpses f ldging a Ntice f Requirement and Designatin f Land. An Issues and Optins reprt was prepared in January Fllwing presentatin f this reprt, Cuncil adpted the Chalmers Avenue t Grve Street ptin as their preferred ptin with the Chalmers Avenue t east f Tinwald ptin as their secnd ptin. Fllwing receipt f Cmmunity feedback n thse ptins, Cuncil then cmmissined further investigatins. This Reprt presents the results f this wrk. Eight ptins fr a secnd rute acrss the Ashburtn River, and an ptin fr signals at an intersectin in Tinwald were investigated further. These investigatins were cnducted in cnjunctin with Taylr Baines and Assciates, wh have prepared a separate Scial Impact Assessment. A Cmmunity Reference Grup has been set up t infrm these investigatins. They have met n a ttal f five ccasins, and their inputs are reflected in the cntents f this final reprt. Cncept drawings f the eight ptins are included as Appendix E (bund separately). The ptins were assessed against a set f criteria agreed at a wrkshp invlving prject team members frm ADC, Taylr Baines and Assciates, and Opus. The assessments were revised fllwing inputs frm the Cmmunity Reference Grup. Tw pssible sets f weightings were als applied t the assessments based n inputs frm the Cmmunity Reference Grup. The final assessments are included as Appendix F (bund separately). As a result f the additinal investigatin wrk and assessments, the fllwing recmmendatins are made: 1. That public cnsultatin n the results f these additinal investigatins, and n the ptins cnsidered be carried ut 2. That fr the purpses f cnsultatin the ptins be categrised as fllws: a. Likely: b. Unlikely: Chalmers Avenue t East f Tinwald (rural) Chalmers Avenue t East f Tinwald (urban) Chalmers Avenue t Grve Street Outer Bypass Inner Bypass Melcmbe Street (Railway level crssing) Melcmbe Street (Railway verpass) SH1 Fur Laning c. That the pssibility f traffic signals in Tinwald be pursued with NZTA in parallel with any secnd bridge prject. 1

8 Intrductin 2 Intrductin Opus has been cmmissined by Ashburtn District Cuncil (ADC) t undertake a technical investigatin fr a secnd bridge acrss the Ashburtn River fr the purpses f ldging a Ntice f Requirement and Designatin f Land. An Issues and Optins reprt was prepared in January Fllwing presentatin f this reprt, Cuncil adpted the Chalmers Avenue t Grve Street ptin as their preferred ptin with the Chalmers Avenue t east f Tinwald ptin as their secnd ptin. Fllwing receipt f Cmmunity feedback n thse ptins, Cuncil then cmmissined further investigatins. This Additinal Investigatin Reprt presents the results f this wrk. In cnjunctin with the wrk carried ut as part f the Scial Impact Assessment, it als recmmends ptins which are likely t prceed, fr the purpses f public cnsultatin. The additinal investigatins cmmissined include the fllwing: Scial Impact Assessment (carried ut by Taylr Baines and Assciates); Frmatin, facilitatin and supprt fr a Cmmunity Reference Grup (carried ut by Taylr Baines and Assciates) Investigatin f impacts n Tinwald Schl f sme ptins`; Further detailed investigatins, including traffic dispersin, lcal rad / state highway interface, and cst estimates fr the fllwing ptins: Eastern Bypass (tw variatins f this ptin have been investigated, an uter Bypass and an inner Bypass); Chalmers Avenue t east f Tinwald (tw variatins f this ptin have been investigated, an ptin thrugh the rural area east f Tinwald, and an ptin thrugh the prpsed urban area in the District Plan Review); Chalmers Avenue t Grve Street; and Melcmbe Street (tw variatins f this ptin have been investigated, an ptin incrprating a level crssing acrss the railway suth f Tinwald, and an ptin with an verpass ver the railway); Liaisn with New Zealand Transprt Agency; and Priritisatin f Transprtatin Study prjects with respect t the 2 nd Bridge. A further ptin f fur laning State Highway 1 was added during the additinal investigatins, and fr reasns f cmpleteness, an assessment was als included fr traffic signals in Tinwald. This is a shrt term ptin which may be pursued in parallel with the secnd bridge prject. 2

9 Backgrund 3 Backgrund Ashburtn twn (the Ashburtn District s largest ppulatin centre) is situated n the Canterbury Plains apprximately midway between Christchurch and Timaru. The twn straddles State Highway 1 (SH1) and the Suth Island Main Trunk railway (SIMT). The State Highway and the railway make up the primary Suth Island transprtatin crridr. The twn is bisected by the Ashburtn River, which runs mre r less perpendicular t SH1 and the SIMT. A map f Ashburtn is shwn in Appendix A. The existing Ashburtn river bridge is the nly means f crssing the Ashburtn River near t SH1. The nearest alternative rute acrss the Ashburtn River invlves a detur f apprximately 60 km. Ashburtn Transprtatin Study In 2005 Transit New Zealand (nw the New Zealand Transprt Agency (NZTA)) and Ashburtn District Cuncil cmmissined Opus t identify present and future transprtatin demands within the Ashburtn urban area thrugh t 2026, and t recmmend measures t ptimise the perfrmance f the land transprt system (the Ashburtn Transprtatin Study). The Ashburtn Transprt Study identified the main future issue t be the ability f State Highway 1 t cpe with increasing traffic vlumes, thrugh the Ashburtn urban area, particularly at the Ashburtn River Bridge. It als identified rute security issues if the existing bridge was clsed fr any reasn, including islated incidents n the bridge r wider natural disasters. A strategy f actins was recmmended in the Ashburtn Transprt Study. One f these recmmendatins is t prvide a secnd bridge acrss the Ashburtn River. The recmmendatins f the study have been adpted by the NZTA. The Ashburtn District Cuncil has als adpted the recmmendatins f the study excluding the site fr the secnd bridge. This was t fllw a separate cnsultatin prcess. Secnd Bridge Issues and Optins Reprt An Issues and Optins Reprt Fr a Secnd Bridge Acrss the Ashburtn River was prepared in January This reprt cnfirmed that the mst significant issues fr the existing bridge were its capacity t carry the future traffic demand, and rute security issues shuld the bridge be clsed due t an incident n the bridge r a wider event such as a fld r earthquake. The Issues and Optins Reprt identified the fllwing twelve ptins fr a secnd bridge rute: Eastern Bypass; Trevrs Rad t East f Tinwald; Leestn Street t East f Tinwald; Chalmers Avenue t East f Tinwald; Chalmers Avenue t Grve Street; William Street t Grve Street; Cass Street t Thmsn Street; 4 Lane Existing Bridge; West Street t Melcmbe Street (ne way nrthbund Existing bridge ne way suthbund); West Street t Melcmbe Street (Relcate SH1 t new bridge, existing SH bridge t becme lcal rad); 3

10 Backgrund Park Street t Tarbttns Rad; Oak Grve t West f Tinwald; Western Bypass; and Eastern Bypass. These ptins were then assessed against the fllwing criteria: Access and Mbility; Land; Engineering Technical; RMA; Plicies, Plans and Strategies; Ecnmics; Risks; Envirnmental Impacts; and Wider Outcmes. The tw ptins which best met these criteria were the Chalmers Avenue t east f Tinwald and the Chalmers Avenue t Grve Street ptins. Cnsultatin n the Optins identified in the Issues and Optins Reprt Extensive public cnsultatin, including a Public Meeting, Cmmunity Open Days, and a mail ut t affected residents, was carried ut fllwing the release f the Issues and Optins Reprt. The results f this cnsultatin are detailed in the Cnsultatin Reprt dated May In summary, the cnsultatin cnfirmed a high level f ppsitin frm the Tinwald cmmunity t the Chalmers Avenue t Grve Street ptin, and t a lesser extent the Chalmers Avenue t east f Tinwald ptin. The mst cmmn issues raised during the cnsultatin included: Effects n residents f Grve Street including: Increase in traffic dwn residential street(s) Heavy vehicles using bridge/rute Disturbance t residents Nise Increase in accidents (including children) Effects n retirement hme Pllutin Reductin in prperty value Exit strategy nt State Highway? Cnsider ptins arund the existing State highway / Melcmbe Street Cnsider the need fr a bypass rather than a lcal bridge. The effect f increased traffic n the Tinwald Schl. The need fr a secnd bridge? Clarify the lcal traffic issue. 4

11 Backgrund Can traffic lights be put in first? The need t think lng term and have the best slutin fr the future. Funding ptins frm NZTA. 5

12 Methdlgy 4 Methdlgy Further investigatins were cnducted n the eight secnd bridge rute ptins listed in sectin 2. The methdlgy fr the investigatins int each f the ptins is utlined belw: Scial Impact Assessment A Scial Impact Assessment (SIA) has been prduced by Taylr Baines and Assciates. The SIA included data cllectin, (including dcument review, interviews with stakehlder grups), and inputs frm the Cmmunity Reference Grup. This infrmatin was then used t prvide inputs int the Multi-criteria assessment f ptins frm a Scial Impact perspective.. Cmmunity Reference Grup A Cmmunity Reference Grup was established and facilitated by Taylr Baines and Assciates. Supprt and inputs were prvided by Opus. Prject team members frm Opus attended Cmmunity Reference Grup meetings t prvide infrmatin and answer queries. The purpse f the Cmmunity Reference Grup was t act as a sunding bard fr advice frm the Tinwald and Ashburtn cmmunity t the cnsultants carrying ut additinal assessment wrk n the 2 nd bridge ptins, with particular attentin t the scpe f the assessment and the methds f cnsultatin. The Terms f Reference f the Cmmunity Reference Grup are included as Appendix 3 f the Scial Impact Assessment. One key query arising frm the Cmmunity Reference Grup cncerned the prprtin f lcal traffic n the existing bridge. This is cvered in sme detail in Sectin 5 f this reprt. The Cmmunity Reference Grup prvided inputs t the fllwing stages f the additinal ptin investigatins: Factrs they cnsidered imprtant t be cnsidered in the ptin assessment; A clean sheet prs and cns assessment f each ptin based n the factrs the cnsidered imprtant; Ranking f criteria suggested by the prject team. This infrmatin was used t prduce pssible assessment weightings; and Cmment n the 1 st draft ptin assessment prduced by the prject team. Optin scres and cmmentaries were amended as a result f these cmments. Reprts t Cuncil f the Cmmunity Reference Grup meetings are included in Appendix 5 f the Scial Impact Assessment. Cnsideratin f Feedback frm Previus Cnsultatin Significant feedback was btained as a result f the cnsultatin fllwing the cmpletin f the Issues and Optins Reprt. Issues raised in the cnsultatin included: Effects n residents f Grve Street including: Increase in traffic dwn residential street(s) Heavy vehicles using bridge/rute 6

13 Methdlgy Disturbance t residents Nise Increase in accidents (including children) Effects n retirement hme Pllutin Reductin in prperty value Exit strategy nt State Highway? Cnsider ptins arund the existing State highway / Melcmbe Street Cnsider the need fr a bypass rather than a lcal bridge. The effect f increased traffic n the Tinwald Schl. The need fr a secnd bridge? Clarify the lcal traffic issue. Can traffic lights be put in first? The need t think lng term and have the best slutin fr the future. Funding ptins frm NZTA. This feedback was further cnsidered in the Scial Impact Assessment, alng with feedback frm face t face interviews and meetings with key stakehlders. The issues raised in the feedback were als incrprated int the cmparative ptin assessment prcess, and addressed in the relevant sectins f this reprt. Getechnical Study Further desk tp getechnical investigatins were carried ut. These invlved discussins with Opus and Ashburtn Cntracting staff wh have been invlved in excavatins in the Tinwald area in recent years (including pipeline replacements, bre drilling and lcal and state highway radwrks), and a review f available literature. These investigatins cnfirmed the assumptins which had been made regarding grund cnditins during the Issues and Optins phase f this prject. The cst f carrying ut specific n site getechnical testing fr each f the ptins being cnsidered was nt cnsidered justified at this stage f the prject. The risks assciated with this apprach have been cnsidered in the preparatin f the range f cst estimates fr each ptin. The findings f the getechnical investigatins are included in Appendix B Discussins with NZTA Meetings have been held with Christchurch based NZTA staff. These meetings have cvered the fllwing issues: Apprpriate design standards fr new sectins f rad which will becme State Highway 1 Likelihd f btaining NZTA funding t ADC s standard subsidy rate fr each ptin; Likelihd f btaining further financial assistance ver and abve ADC s standard subsidy fr each ptin; and 7

14 Methdlgy An infrmal pinin n the viability f each ptin These infrmal discussins indicate the fllwing: NZTA cntinues t stand by the strategy develped as a result f the Ashburtn Transprtatin Study. A key part f that strategy was a 2 nd bridge linking Eastern Tinwald with Chalmers Avenue. They feel that this rute prvides a gd rute between Tinwald and the rest f Ashburtn, and makes gd use f existing underutilised existing infrastructure (particularly Chalmers and Walnut Avenues); NZTA lcally wuld be likely t supprt an applicatin fr funding f ADC s 57% funding subsidy fr such a rute, subject t prject viability and funding availability at the time; NZTA may als be pen t additinal funding beynd ADC s subsidy t accunt fr SH1 betterment resulting frm ne f these ptins prceeding. This wuld be subject t the same prject viability and funding availability cnstraints abve, and t reaching agreement n the value f any State Highway betterment; NZTA lcally wuld be unlikely t supprt an applicatin fr funding fr the bypass, Melcmbe Street, r SH1 fur laning ptins. They cnsider that these ptins are typically mre expensive, and d nt address the issues facing the existing netwrk as effectively as the Chalmers Avenue ptins d; and NZTA cnsider that the standards adpted fr the cncept design and cst estimates fr State Highway ptins cnsidered in this reprt are likely t be n mre than the minimum that NZTA wuld be prepared t accept. In fact they wuld prefer, and may insist n higher standards shuld a State Highway ptin prceed. 8

15 Methdlgy Preliminary Design A cncept design was prepared fr each f the ptins. This cnsisted f a plan, indicating ptin alignment verlaid ver prperty bundary drawings fr the tw bypass ptins, and ver aerial phtgraphs fr all ther ptins. Vertical design was carried ut using Civil3D design sftware based n LIDAR levels prvided by ADC. This enabled apprpriate design gradients t be cnfirmed, depth and quantities f cut and fill, and extents f land required fr cut and fill batters t be estimated. Optin Cncept Plan Drawings are included as Appendix E (bund separately). The specifics f each design are discussed in Sectin 6 belw. Cst Estimates Rugh Order f Cst estimates were prepared fr each ptin based n the preliminary designs and the available getechnical infrmatin. A number f assumptins have been made in the preparatin f the estimates. These are discussed in Sectin 6 belw. The cst estimates shw a range f csts fr each ptin. This range reflects a degree f uncertainty arund sme f the detail f each ptin, particularly regarding detailed design and grund cnditins. Cntingencies have been included fr these uncertainties. The level f cnfidence in the cst estimates is +/- 20%, which is reflected in the range f csts fr each ptin. Mre detailed cst estimates will nt be pssible until detailed design is cmplete. Traffic Mdelling Traffic mdelling was carried ut fr 2016 and 2026 traffic cnditins as part f the Ashburtn Transprtatin Study. The ptins mdelled at that stage were a D Minimum ptin (i.e. n change t the existing rading system), a bypass ptin frm a pint n SH1 suth f Nrthpark Rad t a pint suth f Frds Rad, and an ptin linking Chalmers Avenue t east f Tinwald. Grwth prjectins based n the Ashburtn Develpment Plan were used fr the 2016 and 2026 year mdels. As part f the additinal investigatins, additinal mdelling was carried ut t update the Chalmers Avenue t east f Tinwald ptin t reflect the changes in prpsed develpment f east Tinwald in the District Plan Review when cmpared with the Ashburtn Develpment Plan. It was assumed that traffic vlumes carried by bth the inner and uter bypass ptins cnsidered in these additinal investigatins wuld be significantly less than thse estimated fr the shrt high speed bypass mdelled, that the d minimum traffic vlumes n SH1 wuld remain the same fr the 4 laning ptin, and be split clse t 50/50 between Melcmbe Street and Archibald Street fr the Melcmbe Street ptins. The philsphy behind these assumptins is explained in Sectin 6 Optin Assessment Each f the ptins was assessed against a number f criteria. The criteria were identified, and a preliminary assessment carried ut at a full day wrkshp by prject team members frm Opus, Taylr Baines and Assciates, and ADC. This preliminary assessment was presented t the Cmmunity Reference Grup. Their cmments were cnsidered, and mdificatins were made t 9

16 Methdlgy the assessment as apprpriate. The final assessment is included as Appendix F (bund separately) and summarised in sectin 6. Priritisatin f Transprtatin Study Prjects The Transprtatin Study included a suite f prjects t address the transprtatin issues in Ashburtn, including: Prvide Traffic Signals in Tinwald; Fur lane SH1 between Havelck Street and Mre Street; Revise Dbsn Street / Kermde Street / SH1 intersectin; Prvide a secnd bridge acrss the Ashburtn River; Upgrade Walnut Avenue / SH1 / East Street intersectins; Prvide safe pedestrian and cycle rutes t schls; Imprve pedestrian and cycle access acrss the Ashburtn River These prjects have been cnsidered in cnjunctin with each f the secnd bridge ptins t identify any synergies between the secnd bridge ptins and the Transprtatin Study prjects. Tinwald Schl Impacts n Tinwald Schl have been assessed fr ptins which change the rading netwrk r traffic patterns in the vicinity f Tinwald Schl, particularly n Graham Street. Impacts n ther schls have als been assessed fr ptins which change the rading netwrk r traffic patterns in the vicinity f thse schls. 10

17 Lcal Traffic n Existing Bridge 5 Lcal Traffic n Existing Bridge One f the key determinants f the functin (and therefre lcatin) f a secnd bridge is the prprtin f traffic using the bridge which is lcal rather than thrugh traffic n SH1. Sme members f the Cmmunity Reference Grup queried the cnclusin frm the Ashburtn Transprtatin Study, which was repeated in the Issues and Optins Reprt, that apprximately 30% f traffic n the existing bridge is inter district thrugh traffic. It was felt that a ne ff survey in 2006 may nt accurately reflect the current day t day situatin. Number plate surveys were cnducted n February as part f the Transprtatin Study. These surveys recrded the last three digits f vehicle registratin numbers travelling in bth directins, and times, at nine lcatins in Ashburtn, including n SH1 between Suth Street and the Ashburtn River Bridge, and suth f Jane Street. Number matching sftware was then used t cmpare registratin numbers at different lcatins at similar times. This enabled the identificatin, and cunting, f vehicles which passed ne lcatin and then anther. Results f these surveys indicated that verall less than 30% f traffic n the Ashburtn River Bridge was state highway thrugh traffic (i.e. traffic which was travelling frm nrth f the Ashburtn River Bridge t suth f the Tinwald urban area r vice versa). The remainder left r jined the State Highway smewhere between the bridge and the edge f the Tinwald urban area. The results f the number plate survey were cmpared with hurly NZTA tube cunts frm surveys in January and February These surveys give traffic cunts in each directin every 15 minutes, 24 hurs per day fr 7 days immediately suth f Wills Street and f Suth Street. The available cunts suth f Winslw Rad are a cmbined tw way ttal. The results f these cunts were very similar t thse btained frm the number plate survey. The results f these tw surveys have als been cmpared with daily NZTA tube cunt data between 2000 and These cunts give a ttal tw way average daily cunt fr each f the years just suth f Suth Street and at Winslw. These cunts shw results cnsistent with the hurly cunts abve, namely that cnsistently fr the past 10 years the verall traffic vlume at Winslw has been apprximately 30% f the ttal traffic n the Ashburtn River Bridge. Given that sme f the traffic n SH1 at Winslw wuld have started r finished in Tinwald, this suggests that less than 30% f the traffic n the Ashburtn River Bridge is State Highway thrugh traffic. The results f all three surveys are included in Appendix C. 11

18 Optins 6 Optins As nted in sectin 2 abve, cncept designs and Rugh rder f Cst estimates were prepared fr a ttal f eight ptins. Plans f each f these ptins are included in Appendix E (bund separately). Each f these ptins was cnsidered at a high level in the Issues and Optins reprt. Sme f the ptins are effectively sub ptins (e.g. Chalmers Avenue t East f Tinwald - Urban and Rural sub ptins, and West Street t Melcmbe Street Rail Level Crssing and Rail Overpass sub ptins). In additin t the eight 2 nd bridge rute ptins, an ptin f traffic signals in Tinwald was als included. This is nt, hwever, cnsidered t be a lng term ptin fr a secnd bridge. Each f the ptins is described in detail in the sectins 8 t 16.Errr! Reference surce nt fund. n the fllwing page summarises the key features f each ptin. 12

19 Descriptin/assumptin Bypass: Fairtn- Winslw Bypass: Seafield Rad- Laings Rad Chalmers Ave-East f Tinwald - rural ptin Chalmers Ave-East f Tinwald - urban ptin Chalmers Ave-Grve Street Melcmbe Street: Rail level crssing Melcmbe Street: Rail verpass SH1 4 Laning Tinwald Traffic Signals Status f new rute State Highway Lcal Rad Lcal Arterial Lcal Arterial Lcal Arterial State Highway State Highway State Highway State Highway Ttal length f new rute 26km 9.3km 2.3km 2.3km 2.3km 7.1km 6.8km 4.4km N/A Ttal length f new rad 12.6km 6.2km 2.1km 2.1km 0.6km 3.1km 2.8km 0 N/A Ttal length f existing rad upgraded 13.4km 3.1lm 0.2km 0.2km 1.7km km N/A Bridge Length 360m 360m 360m 360m 420m 360m 360m 360m N/A # f prperties likely t be purchased % f new rad in current urban area 0% ~40% 0% 0% ~20% ~25% ~25% 0% N/A Additinal distance fr SH thrugh traffic ~6km ~2.7km ~1.6km ~1.4km ~1.2km 0km 0km 0km 0km Traffic speed envirnment 100kph 100kph - rural 50kph - urban 100kph rural - 50kph Urban - 50kph 50kph 100kph - rural 50kph - urban 100kph - rural 50kph - urban 50kph 50kph Prprtin f SH thrugh traffic likely t use new rute Small Small Small Small Small Majrity Majrity Majrity N/A Prprtin f traffic between suth f Ashbtn and nrth east Ashburtn likely t use new rute Small Small / Mderate Mderate Mderate Mderate Significant Significant Majrity N/A Prprtin f lcal traffic (~70% f ttal bridge traffic) likely t use new rute Small Small Mderate Significant Significant Mderate Mderate Majrity N/A Traffic reductin n existing bridge Small Small Mderate Significant Significant Mderate Mderate Significant N/A Expected Ttal Prject Cst $69 - $84M $48 - $58M $27 - $32M $30 - $35M $25 - $30M $36 - $43M $38 - $46M $41 - $51M $1-2M NZTA funding cntributin likely N N Pssible Pssible Pssible Unlikely Unlikely Unlikely Likely N f key transp Issues addressed

20 Optin Assessment 7 Optin Assessment Sectins 8 t 16 als include cmments n the cmparative effects f each ptin. Mst assessment wrk n effects t date has cncentrated n the traffic impacts, and the extent t which each ptin meets addresses the issues assciated with the Ashburtn transprtatin system. These issues include the capacity f the existing bridge and assciated rading netwrk t meet future demand, rute security issues, and the lack f quality pedestrian and cycle facilities n the existing bridge. Changes in traffic (vlume, nature / make-up) create the ther envirnmental effects such as nise, vibratin, air quality traffic safety n existing rute, amenity, and streetscape. The full ptin assessment is included in Appendix F (bund separately) and summarised in Sectin 17 A detailed assessment f effects n the envirnment (AEE) has nt yet been undertaken fr any f the ptins. Hwever, a draft AEE will be undertaken fr the recmmended ptin and will be included as part f the final reprt t Cuncil prir t a final decisin n a preferred ptin. The draft AEE will be then finalised and will frm part f the statutry applicatin fr the new designatin. Ntwithstanding the abve, a cnsideratin f the ptential effects f each f the rute ptins is an imprtant part f preliminary ptin assessment that has been undertaken. Tw f the criteria used in the cmparative ptin assessment are envirnmental criteria, namely: Envirnment Water; and Amenity and Public Health. The Envirnment Water criteria cnsiders the impact f a secnd bridge crssing n water quality and river hydraulics (i.e., increased flding risk) within the Ashburtn River as a result f any f the rute ptins. The Amenity and Public Health criteria cnsiders the changes t amenity values (e.g., nise levels, air quality, vibratin, visual effects and streetscape) f any f the rute ptins. It shuld be nted that effects n prperty values have nt been directly cnsidered. Prperty values may be influenced by such factrs as the amenity effects, visual effects, nise effects, traffic effects etc f a prpsal. Therefre, in terms f an AEE it is cnsidered apprpriate t cnsider these effects and implement apprpriate mitigatin measures where pssible. A preliminary AEE has been cnsidered fr each f the rute ptins. It is cnsidered there are sme effects that will be the same r similar fr all f the rute ptins and these are described further belw. Effects that are mre specific t each f the rute ptins are cntained in the descriptin f each ptin. Effects n Heritage Values All f the rute ptins have been assessed in terms f the Ashburtn District Plan, the NZ Archaelgical Assciatin Database and the NZ Histric Places Trust Register. With the exceptin f a number f specific identified heritage buildings lcated alng West Street, there are n ther identified heritage values lcated alng any f the ther rute ptins. 14

21 Optin Assessment With regards t the identified heritage buildings alng West Street, all rad cnstructin / recnstructin wrks assciated with the specific ptins that include West Street can take place within the current rad reserve. There is n requirement fr any additinal land t be taken. On this basis, there will be n adverse effect n the identified heritage buildings in West Street. It is therefre cnsidered there will be n adverse effect n heritage values fr any f the rute ptins. Effects n Cultural Values During the scping f pssible rute ptins, the lcatin f a secnd bridge crssing f the Ashburtn River was discussed with Te Runanga Arwhenua. Te Runanga Arwhenua advised that nce rute ptins had been reduced t the likely pssible ptin(s), they wuld then prvide cmment n cultural values that wuld need t be cnsidered and prvided fr at the specific lcatin. On this basis, n further cmment has yet been sught frm Te Runanga Arwhenua, hwever this will be undertaken as the preferred rute ptin(s) are identified thrugh further cnsultatin and will be included in the final AEE fr the preferred rute. Ntwithstanding the abve, cnstructin wrks may ptentially unearth artefacts f cultural significance. Accidental discvery prtcls will be in place fr any cnstructin activity n any f the rute ptins. Effects n Eclgical Values All ptins invlve the cnstructin f a bridge acrss the Ashburtn River. It is cnsidered that all ptins will likely have the same r similar effects n eclgical values within the Ashburtn River, regardless f its lcatin. Once a preferred rute ptin has been identified, an eclgy assessment related t the specific site will be undertaken. Effects n Hydraulic Capacity The cnstructin f a bridge acrss a river has the ptential t change the hydraulic nature f a river. Bridge abutments culd narrw up and create a cnstrictin f the riverbed, thereby reducing the capacity f the entire riverbed t cnvey fld flws. Likewise, the height f a bridge abve the riverbed can ptentially reduce the cnveyance capacity f a river. It is cnsidered that all secnd bridge rute ptins will have the same r similar effect n the hydraulic capacity f the Ashburtn River. Discussins have been held with Envirnment Canterbury river engineers in relatin t the placement f a secnd rad bridge acrss the Ashburtn River regardless f which rute ptin becmes the preferred ptin. The design f the bridge in relatin t its height abve the riverbed and stpbanks is a factr fr the bridge in any lcatin and ne which can be prvided fr during the detailed design and resurce cnsenting prcess. 15

22 Optin Assessment Cnstructin Related Effects Ptential adverse cnstructin related effects may arise during cnstructin f the bridge and rute cnstructin / recnstructin. Cnstructin related effects include cnstructin nise, dust, and temprary traffic management. All ptins will likely have sme cnstructin related effects fr the duratin f the wrks hwever these effects will be temprary in nature, cnfined t the duratin f the wrks and the effects can be mitigated. Cnstructin nise will be managed and cntrlled in accrdance with the New Zealand Standard NZS 6803:1999 Acustics Cnstructin Nise, and which includes such matters as hurs f peratin and nise levels fr cnstructin machinery. Earthwrks have the ptential t generate dust. This will be mre f an issue fr the rute ptins lcated within residential areas, cmpared t ptins such as the bypasses. Standard cnstructin practice is t use dust suppressin methds such as damping affected areas with water in rder t reduce dust nuisance. The cnstructin f the bridge (at any lcatin) will nt require specific traffic management given that there is n public traffic that needs t be managed at the crssing. Traffic management will be required fr all f the rute ptins during cnstructin / recnstructin wrks. On the basis f the abve, there will likely be sme adverse cnstructin related effects at any f the rute ptins, but these can be mitigated and wuld be f a temprary and shrt term nature. It is therefre expected that any f these cnstructin related effects will be minr. 16

23 Outer Bypass Fairtn t Winslw 8 Outer Bypass Fairtn t Winslw Descriptin A rural State Highway bypass n the fllwing rute: Fairfield Rad Singletree Rad Cchranes Rad River crssing Bundary Rad Winslw Willwby Rad The new rad will becme SH1, and the existing SH1 between the cnnectins t the new rute, and thrugh Ashburtn will becme lcal rad. Design Standards The cncept design and cst estimates fr this ptin are based n the fllwing minimum design standards: Design speed f 110km/h with high speed flwing curves; Rad crss sectin with the fllwing features: 3.5m traffic lane bth sides 2.0m sealed shulder bth sides (this prvides sufficient width fr cyclists t travel clear f the traffic lane) Strmwater cllected in swales n bth sides 24m rad reserve The new rad will have pririty at all intersectins, with Right Turn Bays New rad t seamlessly transitin frm State Highway 1 at bth ends These are cnsidered the abslute minimum current standards fr new rad cnstructin fr a majr State Highway. The abve standards are lwer than the standards adpted fr the Rads f Natinal Significance. If this sectin f SH1 is cnsidered t fall under that categry, then thse higher standards may apply. Rugh Order f Cst Estimate Cnstructin Cst $60M t $73M Land Acquisitin $9M t $11M Ttal Cst $69M t $84M 17

24 Outer Bypass Fairtn t Winslw Assumed NZTA subsidy $ 0 t $ 0 Ttal Cst t ADC $69M t $84M The fllwing items have been included in the abve cst estimate: Cnstructin f new rad in greenfields lcatins Widening and strengthening f existing rads New majr intersectins at Fairtn & Winslw Upgrade f lcal rad intersectins t right turn bays New rail crssing at Fairtn New bridge (360m lng) The upgrade f lcal rads running east west between Ashburtn and new rad has been excluded frm the cst estimate. It is assumed that there will be little increase in traffic n thse rutes due t the new rad, and therefre n upgrade is required as a result f this rad. Traffic Effects This rute will be a rural State highway (100km/hr perating speed) designed and cnstructed t the apprpriate NZ Transprt Agency standards. It will require new rad cnstructin t prvide high speed, sweeping curves t ensure a cnsistent speed f 100km/hr can be maintained. This rute invlves an additinal travel distance f 6km fr SH1 thrugh traffic bypassing Ashburtn. The rute is likely t be slightly quicker than the existing SH1 rute when/if traffic in central Ashburtn is severely cngested, but slwer when central Ashburtn is free flwing. Only sme f the State Highway thrugh traffic is likely t use the new rute. This traffic currently makes up apprximately 30% f peak hur traffic n the existing bridge. Traffic mdelling fr a bypass ptin frm a pint n SH1 suth f Nrthpark Rad t a pint suth f Frds Rad, indicated that this ptin wuld reduce traffic n the existing bridge frm 35,000vpd t 25,000 in A Chalmers Avenue ptin wuld reduce traffic t 21,000vpd. The ptin mdelled is a much mre sweeping and direct rute fr thrugh traffic than the Fairtn t Winslw bypass ptin. Cnsequently the vlume f traffic using the Fairtn t Winslw bypass is expected t be cnsiderably less than the mdelled ptin. The ptin as mdelled uses little r n existing rads, and bisects numerus lifestyle blcks. It was cnsidered n further due t its likely cnstructin and land acquisitin csts being excessively high. Heavy transprt peratrs have indicated that the additinal perating cst assciated with the extra distance tends t be a mre imprtant cnsideratin t them than cmparatively small time savings. They wuld therefre be unlikely t use the new rute until delays in central Ashburtn becme severe. Therefre, at night, heavy vehicles are unlikely t use the uter bypass rute because the rute thrugh central Ashburtn will nt be cngested, will be shrter and therefre a faster rute. Access t the Ashburtn Business Estate frm this rute wuld be via Seafield Rad and Cmpany Rad. The existing SH1 rute thrugh central Ashburtn wuld be mre direct than this 18

25 Outer Bypass Fairtn t Winslw rute. Heavy traffic between suth f Ashburtn and the Business Estate wuld therefre be likely t cntinue t travel thrugh Ashburtn rather than use this rute. Lcal traffic is unlikely t use the new rute at all, because it invlves a detur t travel frm ne side f Ashburtn t the ther. This rute is therefre unlikely t prvide much relief t traffic vlumes n the existing State Highway rute. Cnsequently it is als unlikely t have any significant effect n rad safety in Ashburtn. Rad Safety This rute is likely t result in little change in rad safety thrugh Ashburtn due t the likelihd that it will have little effect n traffic patterns in the twn. Amenity Effects The uter bypass ptin will require the cnstructin f sme new rad, and the widening and strengthening f existing rads n the rute. There is the ptential fr sme negative impact n rural amenity values due t the presence f a State highway, althugh it is nted there are relatively few dwellings alng the rute and expected traffic vlumes will be cmparatively small (refer t traffic effects abve). Nise Effects This bypass ptin wuld mean there is sme additinal traffic that wuld use the rute cmpared t the vlume f traffic that currently uses the existing rads. This additinal traffic wuld nly be sme f the state highway thrugh traffic. There is the ptential fr sme negative impact relating t changes in nise levels assciated with traffic using this rute. Hwever, it is nted there is likely t be a relatively small vlume f traffic using the rute and there are relatively few dwellings affected. It is further nted that traffic nise generally is mre nticeable at night. Heavy vehicles are a majr cntributr t traffic nise. These vehicles are mre likely t use the mre direct rute thrugh the centre f Ashburtn at night as there will be little r n cngestin and it is a shrter rute. Air Quality Effects Changes in air quality are related t the additinal vlume f traffic. There is the ptential fr sme negative impact relating t changes in air quality assciated with the additinal traffic using this rute. Hwever, it is nted there is likely t be a relatively small vlume f traffic using the rute and there are relatively few dwellings affected. Vibratin Effects Vibratin effects are usually assciated with bth the vlume f traffic, the number f heavy vehicles using the rute, and the rughness f the rad surface. 19

26 Outer Bypass Fairtn t Winslw The uter bypass ptin will require all f the identified rads t be bth widened and strengthened t rural state highway standard. Given that state highways are expected and required t carry heavy cmmercial vehicles, the carriageway will be strengthened accrdingly. There may be sme negative impact relating t vibratin, althugh it is nted there is likely t be a relatively small vlume f traffic using the rute and there are relatively few dwellings n this rute. It is nted that, frm a disturbance pint f view, vibratin frm traffic may be mre nticeable at night. Heavy vehicles are a majr cntributr t traffic vibratin. These vehicles are mre likely t use the mre direct rute thrugh the centre f Ashburtn at night as there will be little r n cngestin and it is a shrter rute. Visual Effects The uter bypass rute will have a visual effect due t the wider carriageway and upgraded intersectins that will be required. These intersectins will be lit at night. There will als be the visual effect assciated with a new bridge lcated in the rural envirnment where there are n ther structures in the vicinity acrss the Ashburtn River. Streetscape Effects The rute f the uter bypass ptin wuld be cnstructed as a standard rural State highway with grass berms / swale drains. This is little different t what currently exists alng the rute f the uter bypass ptin. Prperty Effects This ptin wuld require the acquisitin f land frm 42 prperties, and wuld invlve significant prperty severance at the curves. Relatinship t Other Transprtatin Study Prjects This ptin wuld d little t relieve cngestin n SH1 thrugh Ashburtn. Therefre, the prjects t imprve capacity thrugh Ashburtn (fur laning f SH1 between Havelck Street and Mre Street, Dbsn Street / Kermde Street / SH1 intersectin, and Walnut Avenue / SH1 / East Street intersectins) wuld need t be prgressed sner rather than later. The majrity f any safe pedestrian and cycle rutes t schls wuld be separate frm the secnd bridge prject, apart frm the sectin acrss the Ashburtn River. This sectin is discussed belw. This ptin will nt cnnect t any rute t schls within Ashburtn. The uter bypass may be able t imprve pedestrian and cycle facilities acrss the Ashburtn River. Hwever, its remteness frm Ashburtn twn wuld make it incnvenient fr mst lcal pedestrians and cyclists t use it. Cnsequently a prject t upgrade pedestrian and cyclist facilities acrss the river wuld be required in cnjunctin with this prject. Cmments / Ntes 1. Lcal NZTA staff have indicated that this ptin wuld be less effective at addressing the transprtatin issues in Ashburtn than ther ptins cnsidered, and is significantly mre expensive than thse ptins. It wuld therefre be unlikely t btain funding frm NZTA. 20

27 Outer Bypass Fairtn t Winslw 2. Maintenance f this ptin wuld be the respnsibility f NZTA if the ptin were t becme a SH1. Maintenance f the existing SH1 rute alng West Street and Archibald Street (including the existing bridge) wuld then becme the respnsibility f ADC. 3. NZTA funding is unlikely fr this ptin. 4. This ptin nly addresses the key issue f rute security if the existing bridge is clsed. 5. The cmmunity Reference Grup prduced the fllwing list f Prs and Cns fr this ptin. Prs If (majrity f) heavy traffic taken ut f twn. Why wuld heavy traffic use this rute? Cns Lss f custmers fr lcal businesses if thrugh traffic misses twn Cnsiders future grwth in traffic Greater cst fr lnger distance travelled - (therefre truckies unlikely t use this rute) Safer fr schls and students driving t/frm schl Heavy traffic flw frm n/e t s/e crner may use this rute Cnnects with Nrthern Industrial Park t a high speed suthern arterial rute Trucks frm Bundary Rad crusher plant culd use new rad and nt Grve Street High land cst f new rads High cnstructin cst - length f rad N advantage t lcal cmmuters NZTA funding untimely lcal residents pay Limited use by pedestrians and cyclists Tinwald-Ashburtn utility cnnectin still insecure Des nt address West Street intersectin issues 21

28 Inner Bypass Seafield Rad t Laings Rad 9 Inner Bypass- Seafield Rad t Laings Rad Descriptin A cmbined urban and rural bypass n the fllwing rute: Seafield Rad (urban) New link t end f Trevrs Rad (urban) Trevrs Rad (urban) River crssing (urban) New link frm river crssing t end f Gartartan Rad (rural) Gartartan Rad (rural) New link t end f Laings Rad (rural) Laings Rad (rural) The existing East Street/State Highway 1 intersectin will be relcated t Seafield Rad, with the existing State Highway 1 t have pririty. Laings Rad / State Highway 1 intersectin will be upgraded t include right turn bay. The new rad will be a lcal rad. Design Standards The cncept design and cst estimates fr this ptin are based n the fllwing minimum design standards: Design speed f 60km/h n urban sectins and 110km/h n rural; Rad crss sectin with the fllwing features (urban sectin: 3.5m traffic lane bth sides 2.0m cycle lane bth sides 2.0m parking lane bth sides Kerb & Channel bth sides 1.5m ftpath bth sides 3.0m grass berm / strmwater treatment bth sides 24m rad reserve Rad crss sectin with the fllwing features (rural sectin): 3.5m traffic lane bth sides 1.5m sealed shulder bth sides Strmwater cllected in swales n bth sides 24m rad reserve 22

29 Inner Bypass Seafield Rad t Laings Rad Rugh Order f Cst Estimate Cnstructin Cst $39M t $47M Land Acquisitin $9M t $11M Ttal Cst $48M t $58M Assumed NZTA subsidy $ 0 t $ 0 Ttal Cst t ADC $48M t $58M The fllwing items have been included in the abve cst estimate: Cnstructin f new rad in greenfields lcatins Widening and strengthening f existing rads New majr intersectins at Seafield Rad & Laings Rad Upgrade f lcal rad intersectins t right turn bays New rail crssing at Seafield Rad New bridge (360m lng) Traffic Effects This rute will be a cmbinatin f urban (50km/hr perating speed) and rural (100km/hr perating speed) lcal rad designed and cnstructed t the apprpriate ADC rading standards. It invlves an travel distance f 2.5km fr SH1 thrugh traffic bypassing Ashburtn. The rute may be slightly quicker than the existing SH1 rute when/if central Ashburtn is severely cngested, but is likely t be slwer at all ther times. Little State Highway thrugh traffic is likely t use the new rute. This traffic currently makes up apprximately 30% f peak hur traffic n the existing bridge. Heavy transprt peratrs have indicated that the additinal perating cst assciated with the extra distance tends t be a mre imprtant cnsideratin t them than cmparatively small time savings. They wuld therefre be unlikely t use the new rute until delays in central Ashburtn becme severe. Therefre, at night, heavy vehicles are unlikely t use the inner bypass rute because the rute thrugh central Ashburtn will nt be cngested, will be shrter and therefre a faster rute. Other thrugh traffic is unlikely t detur ff the existing State Highway rute. Sme lcal traffic between east Tinwald and east Ashburtn may use the new rute. This rute is therefre unlikely t prvide much relief t traffic vlumes n the existing State Highway rute. Cnsequently it is likely t have little r any impact n rad safety in Ashburtn. 3.5m lane widths & 2.0m cycle lanes may result in higher speeds n urban sectins. Narrwer traffic lanes may be mre apprpriate if the rad is t serve lcal purpse rather than bypass traffic. 23

30 Inner Bypass Seafield Rad t Laings Rad Rad Safety This rute is likely t result in little change in rad safety thrugh Ashburtn due t the likelihd that it will have little effect n traffic patterns in the twn. Amenity Effects The inner bypass ptin will require the cnstructin f sme new rad, and the widening and strengthening f existing rads n the rute. There is the ptential fr sme negative impact n bth rural and urban amenity values. These impacts are minimised by the lw traffic vlumes likely t use this rute, althugh there are a greater number f dwellings affected cmpared t the uter bypass rute ptin. Nise Effects This bypass ptin wuld mean there is sme additinal traffic that wuld use the rute cmpared t the vlume f traffic that currently uses the existing rads. This additinal traffic is expected t be a small prtin f the State highway thrugh traffic, plus sme lcal traffic. There is the ptential fr sme negative impact relating t changes in nise levels assciated with traffic using this rute. Hwever, it is nted there is likely t be a relatively small additinal vlume f traffic using the rute, althugh there are a greater number f dwellings affected cmpared t the uter bypass rute ptin. It is further nted that traffic nise generally is mre nticeable at night. Heavy vehicles are a majr cntributr t traffic nise. These vehicles are mre likely t use the mre direct rute thrugh the centre f Ashburtn at night as there will be little r n cngestin and it is a shrter rute. Air Quality Effects Changes in air quality are related t the additinal vlume f traffic. There is the ptential fr sme negative impact relating t changes in air quality assciated with the additinal traffic using this rute. Hwever, it is nted there is likely t be a relatively small vlume f traffic using the rute, althugh there are a greater number f dwellings affected cmpared t the uter bypass rute ptin. Vibratin Effects Vibratin effects are usually assciated with bth the vlume f traffic, the number f heavy vehicles using the rute, and the rughness f the rad surface. The inner bypass ptin will require all f the identified rads t be bth widened and strengthened t the standard t cater fr the ttal number f vehicles (including heavy vehicles) expected n the rute. There may be sme negative impact relating t vibratin, althugh it is nted there is likely t be a relatively small vlume f traffic using the rute, althugh there are a greater number f dwellings affected cmpared t the uter bypass rute. It is nted that, frm a disturbance pint f view, vibratin frm traffic may be mre nticeable at night. Heavy vehicles are a majr cntributr t traffic nise hwever these vehicles are mre likely t use the mre direct rute thrugh the centre f Ashburtn at night as there will be little r n cngestin and it is a shrter rute. 24

31 Inner Bypass Seafield Rad t Laings Rad Visual Effects The inner bypass rute will have a visual effect due t the new rads that will be required t be cnstructed. The upgraded intersectins within the rural sectin will be lit at night. There will als be the visual effect assciated with a new bridge lcated in the rural envirnment where there are n ther structures in the vicinity acrss the Ashburtn River. Streetscape Effects The rural sectin f the inner bypass ptin wuld be cnstructed as a standard rural rad with grass berms / swale drains. The urban sectin wuld be cnstructed as a standard urban rad with kerb and channel, ftpaths and amenity planting. Prperty Effects This ptin wuld require the acquisitin f land frm 47 prperties, and wuld invlve significant prperty severance at the curves. Relatinship t Other Transprtatin Study Prjects This ptin wuld d little t relieve cngestin n SH1 thrugh Ashburtn. Therefre, the prjects t imprve capacity thrugh Ashburtn (fur laning f S1 between Havelck Street and Mre Street, Dbsn Street / Kermde Street / SH1 intersectin, and Walnut Avenue / SH1 / East Street intersectins) wuld need t be prgressed sner rather than later. The majrity f any safe pedestrian and cycle rutes t schls wuld be separate frm the secnd bridge prject, apart frm the sectin acrss the Ashburtn River. This sectin is discussed belw. Inclusin f pedestrian cycle facilities n Trevrs Rad as part f this prject may be able t link int a pedestrian and cycle rute t Hampstead Schl The inner bypass may be able t imprve pedestrian and cycle facilities acrss the Ashburtn River. Hwever, its remteness frm Tinwald and lcatin n the edge f the Hampstead area wuld make it incnvenient fr mst lcal pedestrians and cyclists t use it. Cnsequently a prject t upgrade pedestrian and cyclist facilities acrss the river wuld be likely t be required in cnjunctin with this prject. Cmments / Ntes 1. Lcal NZTA staff have indicated that this ptin wuld be less effective at addressing the transprtatin issues in Ashburtn than ther ptins cnsidered, and is mre expensive than thse ptins. It wuld therefre be unlikely t btain funding frm NZTA. 2. Maintenance f this ptin wuld be the respnsibility f ADC since this wuld be a lcal rad. Maintenance f the existing SH1 rute alng West Street and Archibald Street (including the existing bridge) wuld remain the respnsibility f NZTA. 3. NZTA funding is unlikely fr this ptin. 4. This ptin nly addresses issue f rute security if the existing bridge is clsed. 25

32 Inner Bypass Seafield Rad t Laings Rad 5. The cmmunity Reference Grup prduced the fllwing list f Prs and Cns fr this ptin Prs Des nt impact n Tinwald urban area Cns Nt a true bypass Prvides rute frm Lake Hd nrth Pssibly used by mre trucks Small cst f land purchase Separate frm mst residential prperties Pssible increase in Tinwald-Ashburtn utility cnnectin security Trucks frm Bundary Rad crusher plant culd use new rad and nt Grve Street Allws fr new rest hme develpment Limited use by lcals SH1 egress/entry difficult; truck use nrth/suth minimal Limited use by pedestrians and cyclists Large amunt f new rading Purchase f prperties, cst? Impacts n urban dwellers - alng Trevrs Rad N advantage t lcals 26

33 Chalmers Avenue t East f Tinwald (Rural) 10 Chalmers Avenue t east f Tinwald (Rural) Descriptin A lcal rad n the fllwing rute: New rundabut at Chalmers Avenue / Suth Street intersectin Extensin f Chalmers Avenue River crssing New rural rad n eastern edge f Residential D zne prpsed in District Plan review New crss rad intersectins at Carters Terrace, Wilkins Rad, and Jhnstne Street New Tee intersectin at Grahams Rad Design Standards The cncept design and cst estimates fr this ptin are based n the fllwing minimum design standards: Design speed f 60km/h n Chalmers Avenue extensin and 110km/h n rural sectin; Rad crss sectin with the fllwing features (Chalmers Avenue extensin between Suth Street and the River): Similar t the crss sectin n the remainder f Chalmers Avenue, namely: Slid median 3.5m traffic lane bth sides 2.0m cycle lane bth sides 2.5m parking bth sides Kerb & Channel bth sides 1.5m ftpath bth sides 3.0m wide grass berm / strmwater treatment bth sides 40m wide rad reserve Rad crss sectin with the fllwing features (rural sectin): 3.5m traffic lane bth sides 1.8m cycle lane bth sides 0.5m sealed shulder bth sides Strmwater cllected in swales bth sides 24m rad reserve New rad t be lcal arterial rad 27

34 Chalmers Avenue t East f Tinwald (Rural) New rad t have pririty at Carters Terrace, Wilkins Rad, and Jhnstne Street intersectins all t have right turn bays n new rad Grahams Rad t have pririty, with right turn bay Intersectins with SH1 t remain unchanged see nte 2 belw Rugh Order f Cst Estimate Cnstructin Cst $25M t $30M Land Acquisitin $1.3M t $1.6M Ttal Cst $26.3M t $31.6M Assumed NZTA subsidy $15M t $18M (57% subsidy rate) Ttal Cst t ADC $11.3M t $13.6M The fllwing items have been included in the abve cst estimate: Rundabut at Chalmers Avenue / Suth Street intersectin Chalmers Avenue extensin t river New bridge (360m lng) New rad t Grahams Rad Allwance fr minr wrks ($100k) n Graham Street near Tinwald Schl (see ntes 4 & 5 belw) Land acquisitin csts The fllwing items have been excluded frm the abve cst estimate: Upgrades t Chalmers Avenue nrth f Suth Street - Rad has adequate capacity & already carries significant traffic vlumes Upgrades t Bridge Street Upgrade is planned independent f this prject Upgrades t Carters Terrace, Wilkins Rad, Jhnstne Street & Grahams Rad between new rad and existing urban area. - It is assumed that this wrk will be dne in cnjunctin with future residential develpment n these streets. This ptin will prvide access t ptential new lts in the prpsed Residential znes. Sme funding frm the develpers f these lts may be available via develper cntributins. This has nt been included in the calculatin f cst t ADC abve. Traffic Effects This rute will be a cmbinatin f urban (50km/hr perating speed) and rural (100km/hr perating speed) lcal rad designed and cnstructed t the apprpriate ADC rading standards. This is a high speed rute with minimal delays. It will reduce lcal traffic vlumes n SH1 thrugh 28

35 Chalmers Avenue t East f Tinwald (Rural) Ashburtn. Lcal traffic cnstitutes the bulk f the traffic n the Ashburtn River Bridge (as nted elsewhere). This rute is likely t attract sme thrugh traffic between SH1 suth and nrth-eastern Ashburtn. Traffic signals at Grahams Rad / SH1 wuld make it easier fr this traffic t use this rute. Signals have therefre nt been included s as t encurage thrugh traffic t use State Highway 1 as much as pssible. Traffic vlumes n Carters Terrace, Wilkin Street, Jhnstne Street and Graham Street are likely t increase as a result f prpsed zne changes and assciated develpment east f Tinwald, and grwth at Lake Hd, regardless f a secnd bridge. Traffic frm thse develpments is likely t use the new rute t access Ashburtn. This will result in a reductin in traffic using the abve streets t access SH1. Hwever, traffic frm the existing urban area east f Tinwald, and sme traffic frm SH1, but increase vlumes frm the existing urban area and State Highway. As nted abve, traffic vlumes n Graham Street are likely t increase as a result f grwth at Lake Hd and in the prpsed residential znes east f Tinwald. Much f that traffic is likely t use this rute t access Ashburtn and ther lcatins nrth f the Ashburtn River rather than using Graham Street and SH1 acrss the river. Hwever, sme traffic between nrth-eastern Ashburtn and suth f Ashburtn is likely t use this new rute, and Graham Street. These tw traffic surces will tend t cancel each ther ut, and the result is expected t be little change in the verall traffic vlumes n Graham Street. Allwance has been made t prvide traffic calming, such as raised platfrms, near Harland Street and Thmsn Street. This will slw traffic past Tinwald Schl, and imprve the pedestrian crssing facilities at these lcatins. It will als encurage traffic frm east f Tinwald (including Lake Hd) t use the new rute t access Ashburtn, and discurage State Highway traffic frm using the new rute t access the nrth-eastern Ashburtn area. This in turn is likely t reduce traffic vlumes n Graham Street. The 2010 District Plan review prpses t rezne an area east f the existing Tinwald urban area, t enable future residential develpment. This ptin will enhance access t the wider eastern Tinwald area, including the area prpsed fr rezning, by prviding a cllectr rute alng the edge f the prpsed Residential D zne. Any future residential develpment in this area wuld als require a netwrk f new lcal rads cnnecting t this cllectr rute. The mdel predicts AADT in 2026 at Chalmers Avenue, suth f Victria Street will increase frm 8,000 vehicles/day t 14,000 vehicles/day, as a cnsequence f implementing a Chalmers Avenue ptin. This rute will result in an increase in traffic numbers alng Chalmers Avenue particularly near t the secnd bridge. While the majrity f this traffic is expected t dissipate ver the length f Chalmers Avenue, there will be a residual increase in traffic alng Bridge Street. Chalmers Avenue is already a high capacity rad readily able t cpe with the additinal traffic vlume. Chalmers Avenue frm Suth Street t Walnut Avenue is identified in the Ashburtn District Plan as a Principal Rad. Bridge Street is currently nt cnstructed as a high capacity rad but is als identified as a Principal Rad. Bridge Street is expected t take increased traffic due t the 29

36 Chalmers Avenue t East f Tinwald (Rural) Ashburtn Business Estate and is therefre already identified in the LTCCP fr upgrade regardless f the secnd bridge. There is likely t be little advantage t heavy vehicles travelling frm suth f Ashburtn t the nrth-eastern areas f twn in using this rute at night. This is because there will be few delays thrugh central Ashburtn and there is little r n difference in the ttal distance travelled. Therefre they are less likely t use this rute at night than during the day. Rad Safety This rute is likely t result an imprvement in rad safety n SH1 in Tinwald as a result f the reductin in Tinwald traffic turning right acrss SH1. It als prvides a safer rute fr cyclists and pedestrians acrss the river than the existing. Hwever the lack f pedestrian facilities and higher speeds n the rural sectin between the river and Graham Street make this sectin less safe fr pedestrians and cyclists than ptins in the urban area. Effects n Schls As nted abve, there is expected t be little change in verall traffic vlumes n Graham Street near Tinwald Schl. This rute is lcated beynd the existing r prpsed urban area f Tinwald. It is therefre unlikely that students travelling t r frm Tinwald Schl will need t crss the new urban rad n this rute. Cnsequently the verall impacts n Tinwald Schl are assessed as being small. Hampstead and Netherby Schls are bth lcated remte frm this rute. Therefre this ptin is likely t have little impact n the immediate envirns f these schls. Sme pupils may need t crss Chalmers Avenue, Walnut Avenue r Bridge Street t access these schls. Each f these rads is likely t experience additinal traffic vlumes as a result f this ptin. All three rads are currently identified as principal rads in the Ashburtn District plan, and carry significant traffic vlumes. The slid median n Chalmers and Walnut Avenues prvide a safe refuge fr pedestrians crssing the rad. Hwever, the width f carriageway n each side f the rad means that pedestrians are expsed t traffic fr lnger perids f time when crssing. Cnsequently these rads are likely t be intimidating fr sme pedestrians, especially if crssing remte frm the pedestrian facilities prvided. The impacts f the cmparatively small increase in traffic vlumes n schl pedestrians n these rads is likely t be smaller than a similar increase n a lw vlume lcal rad. Ashburtn Intermediate Schl and Ashburtn Cllege are bth lcated n Walnut Avenue. Bth schls will face sme increase in traffic n Walnut Avenue utside the schls, with the Cllege facing a much smaller increase. As nted abve, Walnut Avenue is a high capacity rad. It is a divided rad utside the Intermediate Schl, and undivided utside the cllege. The impacts f a small increase in traffic utside bth schls are expected t be small. Effects n Prpsed Riverview Retirement Village This ptin des nt directly affect the prpsed Retirement Village n Carters Terrace ppsite Grve Street. The pssible increase in traffic vlumes n Carters Terrace utside the prpsed cmplex may have sme negative impacts n amenity f the cmplex. Hwever, a secnd bridge 30

37 Chalmers Avenue t East f Tinwald (Rural) and alternative rute acrss the Ashburtn River is likely t result in significant imprvements in accessibility fr the retirement village. Amenity Effects This ptin increases the traffic vlumes n existing urban rads within Ashburtn. It als requires the cnstructin f a new rad in rural Tinwald. There is likely t be sme negative impacts n bth rural and urban amenity values. While there is expected t be a small imprvement in amenity n SH1 thrugh Ashburtn, this is ffset by a reductin in amenity n the suthern sectin f Chalmers Avenue. There will als be sme reductin in rural amenity n the greenfields rute east f Tinwald. This affects a small number f larger sized prperties. It is nted the nature f this area is likely t change t smaller sized prperties with the prpsed zne changes under the District Plan review. Any future develpment t smaller prperties wuld be undertaken in the knwledge f this rute. Furthermre, any future residential develpment will require additinal rads ver and abve the existing rad netwrk in rder t service these develpments. There is ging t be a change in the amenity f the area east f Tinwald if the prpsed district plan changes prceed, regardless f which rute ptin is chsen fr the secnd bridge. Nise Effects There will be a change in traffic nise n Chalmers Avenue (particularly the suthern end) and Bridge Street resulting frm the increase in traffic vlumes. Bth f these rads are currently designated as Principal Rads. As such, they are already expected t carry a significant vlume f traffic. The District Plan signals therefre that residents shuld expect the resultant nise levels assciated with that level f traffic. In relatin t the new sectin f rad east f Tinwald, traffic nise levels will increase generally within the area. This will likely have an effect n the amenity values fr the existing dwellings adjacent t the rad, althugh these are nly relatively few in number. Any future residential develpment arising frm the District Plan review will be undertaken in the knwledge f this rute ptin. Likewise, peple purchasing newly develped residential land will als be aware f this rute ptin and can design their huses accrdingly. As nted abve, heavy vehicles are less likely t use this rute at night than during the day. This will reduce the nise impacts f heavy vehicles n this rute. Air Quality Effects Changes in air quality are related t the additinal vlume f traffic. Hwever, as nted in the sectin immediately abve, bth Chalmers Avenue and Bridge Street are identified in the District Plan as Principal Rads. In relatin t the new sectin f rad east f Tinwald, there is ptential fr an impact n air quality as a result f this ptin. Hwever this needs t be seen in the cntext f the impact n air quality assciated with the general develpment f this area as a result f any changes t the District Plan 31

38 Chalmers Avenue t East f Tinwald (Rural) zning. There will be an increase in peple living in the area and a ptential impact n air quality, regardless f where the secnd bridge is lcated. Vibratin Effects Vibratin effects are usually assciated with bth the vlume f traffic, the number f heavy vehicles using the rute, and the rughness f the rad surface. Bridge Street is already identified fr widening and strengthening regardless f the secnd bridge lcatin. This upgrade will reduce vibratin effects ver the upgraded length f rad. There is ptential fr sme increased vibratin alng Chalmers Avenue as a result f this rute ptin. The new rad east f Tinwald will be cnstructed t the standard required t cater fr the ttal number f vehicles (including heavy vehicles) expected n the rute. This new rad cnstructin will minimise vibratin effects n this sectin f rad. It is nted that, frm a disturbance pint f view, vibratin frm traffic may be mre nticeable at night. As nted abve, heavy vehicles are less likely t use this rute at night than during the day. This will reduce the ptential vibratin impacts f heavy vehicles n this rute. Visual Effects There is likely t be little visual effect alng Chalmers Avenue and Bridge Street as a result f this rute ptin because there will be little change t the rad layut and crss sectin thrugh these areas. There will be a ptential visual effect assciated with a new bridge acrss the Ashburtn River in this lcatin. The existing rad and rail bridges are reasnably clse t this bridge lcatin. There will be visual effect assciated with the new rad thrugh the east Tinwald greenfields. Hwever, as abve this needs t be seen in the cntext f the ptential urban develpment in this area and the future need fr a lcal rad netwrk t supprt future residential grwth. Streetscape Effects There is likely t be little change t the streetscape alng Chalmers Avenue and Bridge Street as a result f this rute ptin because there will be little change t the rad layut and crss sectin thrugh these areas. The new rad thrugh the east Tinwald greenfields will be cnsistent with the ther rural rads in the vicinity. Therefre, it will nt be ut f place within this envirnment. Prperty Effects This ptin wuld require the acquisitin f land frm 6 prperties. Severance effects may be able t be minimised by running the new alignment alng existing prperty bundaries wherever pssible. 32

39 Chalmers Avenue t East f Tinwald (Rural) Relatinship t Other Transprtatin Study Prjects This ptin is expected t prvide significant relief t traffic cngestin thrugh central Ashburtn. Therefre, there is likely t be sme inter-relatinship between the prjects t imprve capacity thrugh Ashburtn (fur laning f SH1 between Havelck Street and Mre Street, Dbsn Street / Kermde Street / SH1 intersectin, and Walnut Avenue / SH1 / East Street intersectins), and this 2 nd bridge ptin. Advancing the State Highway prjects plus the traffic signals in Tinwald wuld be likely t enable the secnd bridge between Chalmers Avenue and east f Tinwald t be delayed. Cnversely, advancing the secnd bridge wuld be likely t allw the State Highway prjects in central Ashburtn t be delayed, and pssibly negate the need fr traffic signals in Tinwald. The majrity f any safe pedestrian and cycle rutes t schls wuld be separate frm the secnd bridge prject, apart frm the sectin acrss the Ashburtn River. This sectin is discussed belw. Inclusin f pedestrian and cycle facilities n this rute wuld be able t be linked t pedestrian and cycle rutes t Ashburtn Intermediate and Ashburtn Cllege. Hwever the absence f pedestrian and cycle facilities n the rural sectin between the river and Grahams Rad limits the effectiveness f this rute fr pupils living in Tinwald. The Chalmers Avenue t east f Tinwald (rural) rute is likely t imprve pedestrian and cycle facilities acrss the Ashburtn River. Hwever, the lack f dedicated pedestrian and cyclist facilities and lcatin n the edge f the Tinwald urban area reduce its cnvenience fr Tinwald residents. Cnsequently a prject t upgrade pedestrian and cyclist facilities acrss the river wuld be likely t be required in cnjunctin with this prject. Cmments / Ntes 1. Lcal NZTA staff have indicated that this ptin wuld be likely t be ne f the ptins which mst effectively address the transprtatin issues in Ashburtn. They wuld therefre be likely t supprt a funding applicatin fr this ptin assuming all ther funding criteria were met. 2. Maintenance f this ptin wuld be the respnsibility f ADC. Maintenance f the existing SH1 rute alng West Street and Archibald Street (including the existing bridge) wuld the respnsibility f NZTA. 3. NZTA funding is pssible fr this ptin. 4. Because this ptin prvides significant benefits t SH1, it may be pssible t get additinal funding frm NZTA fr this ptin (ver and abve the 57% subsidy). This will need t be negtiated with NZTA, and has nt been included in the NZTA subsidy abve. 5. This ptin addresses the fllwing key issues a. Rad safety thrugh Tinwald, and fr pedestrians and cyclists crssing the river b. Future cngestin n the existing bridge and assciated rad netwrk. c. Accessibility between Tinwald and key destinatins within twn d. Rute security if the existing bridge is clsed. 6. The cmmunity Reference Grup prduced the fllwing list f Prs and Cns fr this ptin. 33

40 Chalmers Avenue t East f Tinwald (Rural) Prs Suthern end f Tinwald wuld access it, lcal use Speed /faster [Sme]cycle and pedestrian use, safer Least cstly Tinwald urban amenity maintained Scpe fr suthern extensin t Frds Rad Develpers wuld be aware f the pssibility f a rad and bridge when buying Gd access fr Lake traffic Pssible NZTA funding Pssible increase in Tinwald- Ashburtn utility cnnectin security Trucks n Bundary Rad crusher plant culd use new rad and nt Grve Street Allws new rest hme develpment May partially address sme f the West Street intersectin issues Cns 50 kph wuld be better than 100 kph less friendly fr car, bike, pedestrian use Ptential fr mre truck use alng Chalmers Avenue Intersectins wuld need t be difficult fr truckies Nise and pllutin in twn with the extra heavy traffic Safety f schls impacted N exit strategy T clse t scut park 34

41 Chalmers Avenue t East f Tinwald (Urban) 11 Chalmers Avenue t east f Tinwald (Urban) Descriptin A lcal rad n the fllwing rute: Rundabut at Chalmers Avenue / Suth Street intersectin Chalmers Avenue extensin t river New bridge (360m lng) New urban rad between Ashburtn River and Jhnstne Street thrugh Residential D zne prpsed in District Plan review. New urban rad alng edge f prpsed Residential C zne between Jhnstne Street and Grahams Rad. New crss rad intersectins at Carters Terrace, Wilkins Rad, and Jhnstne Street. The frm f these intersectins t be cnfirmed. Culd either be rundabuts r right turn bays. New Tee intersectin at Grahams Rad, with right turn bay n Grahams Rad. Design Standards The cncept design and cst estimates fr this ptin are based n the fllwing minimum design standards: Design speed f 60km/h; Rad crss sectin with the fllwing features (Chalmers Avenue extensin between Suth Street and the River): Similar t the crss sectin n the remainder f Chalmers Avenue, namely Slid median 3.5m traffic lane bth sides 2.0m cycle lane bth sides 2.5m parking bth sides Kerb & Channel bth sides 1.5m ftpath bth sides 3.0m wide grass berm / strmwater treatment bth sides 40m wide rad reserve Rad crss sectin with the fllwing features (between bridge and Grahams Rad): 2.0m Flush (painted) Median 3.5m traffic lane bth sides 1.8m cycle lane bth sides 2.0m parking bth sides 35

42 Chalmers Avenue t East f Tinwald (Urban) Kerb & Channel bth sides 1.5m ftpath bth sides 2.7m wide grass berm / strmwater treatment bth sides 25m wide rad reserve New rad t be lcal arterial rad Grahams Rad t have pririty, with right turn bay Intersectins with SH1 t remain unchanged see nte 2 belw Rugh Order f Cst Estimate Cnstructin Cst $27M t $32M Land Acquisitin $2.5M t $3M Ttal Cst $29.5M t $35M Assumed NZTA subsidy $16.8M t $19.95M (57% subsidy rate ) Ttal Cst t ADC $12.7M t $15.1M The fllwing items have been included in the abve cst estimate: Rundabut at Chalmers Avenue / Suth Street intersectin Chalmers Avenue extensin New bridge (360m lng) New rad t Grahams Rad Allwance fr minr wrks ($100k) n Graham Street near Tinwald Schl (see nte 5 belw) Land acquisitin csts The fllwing items have been excluded frm the abve cst estimate: Upgrades t Chalmers Avenue nrth f Suth Street - Rad has adequate capacity & already carries significant traffic vlumes Upgrades t Bridge Street Upgrade is planned independent f this prject Upgrades t intersectins f lcal rads with State Highway 1 see nte 2 belw Upgrades t Carters Terrace, Wilkins Rad, Jhnstne Street & Grahams Rad between new rad and existing urban area. It is assumed that this wrk will be dne in cnjunctin with future residential develpment n these streets. This ptin is identical t the Chalmers Avenue t east f Tinwald (Rural) ptin nrth f the river. It is als similar t that ptin suth f the river, except that this ptin will include an urban rad running mre r less central thrugh the prpsed Residential D zne between the river and Jhnstne Street, and between the prpsed Residential C and D znes between Jhnstne and Graham Streets. 36

43 Chalmers Avenue t East f Tinwald (Urban) Mst f the effects f this ptin will be the same as thse f the Chalmers Avenue t east f Tinwald (Rural) ptin. Only thse effects which differ frm that ptin have been cnsidered belw. Hwever, it is wrth repeating that there is ging t be a change in the amenity f the area east f Tinwald if the prpsed district plan changes prceed, regardless f which rute ptin is chsen fr the secnd bridge. Traffic Effects This is an urban rute with 50km/h perating speeds thrughut. It is therefre likely t attract less thrugh traffic between SH1 suth f Ashburtn and nrth-eastern Ashburtn than the Chalmers Avenue rural ptin This ptin will pass thrugh the centre f the prpsed Residential D zne. This will enable mre f any new Residential D lts t have direct access t this rute, and the remainder f the rading netwrk than the rural ptin. This ptin als runs between the Residential C and D znes. This lcatin will enable it t prvide direct access t a number f the higher density Residential C lts. Rad Safety This rute is likely t result an imprvement in rad safety n SH1 in Tinwald as a result f the reductin in Tinwald traffic turning right acrss SH1. It als prvides a safer rute fr cyclists and pedestrians acrss the river than the existing. The prvisin f purpse built pedestrian and cycle facilities n the new rad suth f the river will imprve pedestrian and cyclist safety ver this sectin. Effects n Schls As nted abve, there is expected t be little change in verall traffic vlumes n Graham Street near Tinwald Schl. This rute is lcated beynd the existing r prpsed urban area f Tinwald. It is therefre unlikely that schl travelling t r frm Tinwald Schl will need t crss the new urban rad n this rute. Cnsequently the verall impacts n Tinwald Schl are assessed as being small. Hampstead and Netherby Schls are bth lcated remte frm this rute. Therefre this ptin is likely t have little impact n the immediate envirns f these schls. Sme pupils may need t crss Chalmers Avenue, Walnut Avenue r Bridge Street t access these schls. Each f these rads is likely t experience additinal traffic vlumes as a result f this ptin. All three rads are currently identified as principal rads in the Ashburtn District plan, and carry significant traffic vlumes. The slid median n Chalmers and Walnut Avenues prvide a safe refuge fr pedestrians crssing the rad. Hwever, the width f carriageway n each side f the rad means that pedestrians are expsed t traffic fr lnger perids f time when crssing. Cnsequently these rads are likely t be intimidating fr sme pedestrians, especially if crssing remte frm the pedestrian facilities prvided. The impacts f the cmparatively small increase in traffic vlumes n schl pedestrians n these rads is likely t be smaller than a similar increase n a lw vlume lcal rad. Ashburtn Intermediate Schl and Ashburtn Cllege are bth lcated n Walnut Avenue. Bth schls will face sme increase in traffic n Walnut Avenue utside the schls, with the Cllege facing a much smaller increase. As nted abve, Walnut Avenue is a high capacity rad. It is a divided rad utside the Intermediate Schl, and undivided utside the cllege. The impacts f a small increase in traffic utside bth schls are expected t be small. 37

44 Chalmers Avenue t East f Tinwald (Urban) Effects n Prpsed Riverview Retirement Village This ptin des nt directly affect the prpsed Retirement Village n Carters Terrace ppsite Grve Street. The pssible increase in traffic vlumes n Carters Terrace utside the prpsed cmplex may have sme negative impacts n amenity f the cmplex. Hwever, a secnd bridge and alternative rute acrss the Ashburtn River is likely t result in significant imprvements in accessibility fr the retirement village. Amenity Effects Nise Effects The lwer traffic speeds thrugh the Tinwald sectin f this ptin are expected t result in lwer traffic nise levels thrugh the residential area. It is als likely that this ptin will include quieter surfacing, such as Asphaltic Cncrete in the residential area. Cnsequently the nise levels are expected t be lwer than fr the Chalmers Avenue t east f Tinwald (Rural) ptin. Hwever, its lcatin thrugh the prpsed Residential D and between the Residential C and D znes will result in mre future dwellings being affected by the nise generated. As nted under the rural ptin, any future residential develpment arising frm the District Plan review will be undertaken in the knwledge f this rute ptin. Likewise, peple purchasing newly develped residential land will als be aware f this rute ptin and can design their huses accrdingly. Air Quality Effects It is cnsidered that any changes in air quality as a result f this ptin will be similar t thse as a result f the rural ptin, but may ptentially affect mre dwellings in the prpsed Residential C and D znes. This will happen as part f air quality changes assciated with a pssible greater residential density in this area. Vibratin Effects Lwer traffic speeds are likely t result in an verall reductin in vibratin effects when cmpared t the rural ptin, but as nted in the nise sectin, these may affect a larger number f future dwellings Visual Effects The visual effects f this ptin are very similar t thse f the rural ptin Streetscape Effects The new rad thrugh the Tinwald greenfields sectin will be an urban rad which is significantly different t the existing rads currently in the area. Hwever, shuld the District Plan review prpsals prceed, any new rads in this area are likely t be urban rads, and the existing rural rads are likely t becme urban rads. This ptin wuld therefre be cnsistent with the prpsed urban envirnment in this area. The Tinwald sectin f this ptin wuld becme an extensin f Chalmers Avenue. This sectin culd be cnstructed with a streetscape similar t the existing streetscape in Chalmers Avenue.. This wuld create a wide avenue with a slid planted median right thrugh the urban area frm Walnut Avenue t Grahams Rad. This apprach wuld have psitive effects n the streetscape and general amenity f this area, but cmes at a higher cst and has few transprtatin impacts. It has therefre nt been csted r cnsidered when cmparing ptins. The ptin which has been csted and used fr cmparisn 38

45 Chalmers Avenue t East f Tinwald (Urban) f ptins is fit fr purpse as a high capacity arterial urban rad, but wuld nt result in as high a quality urban envirnment as currently exists n Chalmers Avenue, Walnut Avenue and Oak Grve. Prperty Effects This ptin wuld require the acquisitin f land frm 10 prperties. It is likely t require the demlitin f hmes and / r prperty severance depending n final chsen alignment. Prperty severance is unlikely t result in lt sizes smaller than the minimum lt size prpsed under Residential D f 4,000m 2 Relatinship t Other Transprtatin Study Prjects This ptin is expected t prvide significant relief t traffic cngestin thrugh central Ashburtn. Therefre, there is likely t be sme inter relatinship between the prjects t imprve capacity thrugh Ashburtn (fur laning f SH1 between Havelck Street and Mre Street, Dbsn Street / Kermde Street / SH1 intersectin, and Walnut Avenue / SH1 / East Street intersectins), and this 2 nd bridge ptin. Advancing the State Highway prjects plus the traffic signals in Tinwald wuld be likely t enable the secnd bridge between Chalmers Avenue and east f Tinwald t be delayed. Cnversely, advancing the secnd bridge wuld be likely t allw the State Highway prjects in central Ashburtn t be delayed, and pssibly negate the need fr traffic signals in Tinwald. The majrity f any safe pedestrian and cycle rutes t schls wuld be separate frm the secnd bridge prject, apart frm the sectin acrss the Ashburtn River. This sectin is discussed belw. Inclusin f pedestrian and cycle facilities n this rute wuld be able t be linked t pedestrian and cycle rutes t Ashburtn Intermediate and Ashburtn Cllege. This wuld be a particular advantage t pupils f these schls living in eastern areas f Tinwald. The Chalmers Avenue t east f Tinwald (rural) rute is likely t imprve pedestrian and cycle facilities acrss the Ashburtn River. The prvisin f purpse built dedicated pedestrian and cycle facilities within the prpsed new Tinwald urban areas will prvide a safe and cnvenient pedestrian and cycle rute t and frm eastern Tinwald. Hwever, this rute wuld be less cnvenient fr pedestrians and cyclists in the western and, t a lesser extent, central, areas f Tinwald. Cnsequently a prject t upgrade pedestrian and cyclist facilities n r near the existing bridge wuld be likely t be required in cnjunctin with this prject. The prvisin f cycle and pedestrian facilities alng a new rad in the prpsed extended urban area f Tinwald may be able t be linked t a pedestrian and cycle rute t Tinwald Schl. This rute may mre apprpriately use lw vlume lcal rads such as Grve Street and Thmsn Street. Cmments / Ntes 1. Lcal NZTA staff have indicated that this ptin wuld be likely t be ne f the ptins which mst effectively address the transprtatin issues in Ashburtn. They wuld therefre be likely t supprt a funding applicatin fr this ptin assuming all ther funding criteria were met. 39

46 Chalmers Avenue t East f Tinwald (Urban) 2. Maintenance f this ptin wuld be the respnsibility f ADC. Maintenance f the existing SH1 rute alng West Street and Archibald Street (including the existing bridge) wuld the respnsibility f NZTA. 3. NZTA funding is pssible fr this ptin. 4. Because this ptin prvides significant benefits t SH1, it may be pssible t get additinal funding frm NZTA fr this ptin (ver and abve the 57% subsidy). This will need t be negtiated with NZTA, and has nt been included in the NZTA subsidy abve. 5. This ptin addresses the fllwing key issues: a. Rad safety thrugh Tinwald, and fr pedestrians and cyclists crssing the river b. Future cngestin n the existing bridge and assciated rad netwrk. c. Accessibility between Tinwald and key destinatins within twn d. Rute security if the existing bridge is clsed. 6. The cmmunity Reference Grup prduced the fllwing list f Prs and Cns fr this ptin. Prs Takes traffic away frm urban residential areas like Grve Street Prvides cyclists with safe rute Shrter bridge NZTA funding likely Nt taking existing residential land Allws fr future grwth Fewer land wners affected 40 Cns Shrtest rute will attract heavy vehicle traffic Exit issues Utilising rural land which can becme residential Land cst New rad prvides access/frntage t future residential subdivisin east f Tinwald Affected land wners have right t negtiate full cmpensatin New rad clse enugh t Tinwald t prvide mst advantages f direct urban cnnectins withut residential cnflicts Increase in Tinwald- Ashburtn utility cnnectin security Trucks frm Bundary Rad crusher plant culd use new rad and nt Grve Street Issue fr Tinwald primary schl Cngestin n Chalmers Avenue/ Mre Street rundabut - upgrading necessary f streets t cpe with traffic increase Fewer streets t filter traffic thrugh T clse t scut park Why put a rad thrugh future residential; depreciatin f land sales Crssing f main high way an issue

47 Chalmers Avenue t East f Tinwald (Urban) Traffic frm rural area east f Tinwald des nt have t g thrugh existing urban area Scpe fr suthern extensin t Frds Rad Allws develpment f new rest hme Assists West Street intersectin issues. 41

48 Chalmers Avenue t Grve Street 12 Chalmers Avenue t Grve Street Descriptin An urban lcal rad n the fllwing rute: Rundabut at Chalmers Avenue / Suth Street intersectin Extensin f Chalmers Avenue New river crssing New rad t link t end f Grve Street Upgrade f Grve Street (new kerb and channel, recnstructin f rad) Intersectin layut at Carters Terrace, Wilkins Rad, and Jhnstne Street intersectins t be cnfirmed either rundabuts r new rad t have pririty with right turn bays n new rad. Design Standards The cncept design and cst estimates fr this ptin are based n the fllwing minimum design standards: Design speed f 60km/h; Rad crss sectin with the fllwing features (Chalmers Avenue extensin between Suth Street and the River): Similar t existing Chalmers Avenue Slid median 3.5m traffic lane bth sides 2.0m cycle lane bth sides 2.5m parking bth sides Kerb & Channel bth sides 1.5m ftpath bth sides 3.0m wide grass berm / strmwater treatment bth sides 40m wide rad reserve Rad crss sectin with the fllwing features (Grve Street): 2.0m Flush (painted) Median 3.2m traffic lane bth sides 2.8m cmbined parking and cycle lane bth sides Kerb & Channel bth sides 1.5m wide ftpath bth sides 1.5m berm bth sides Existing 20m wide rad reserve New rad t be lcal arterial rad Grahams Rad t have pririty, with right turn bay Intersectins with SH1 t remain unchanged see nte 2 belw 42

49 Chalmers Avenue t Grve Street Rugh Order f Cst Estimate Cnstructin Cst $24M t $29M Land Acquisitin $0.7M t $0.8M Ttal Cst $24.7M t $29.8M Assumed NZTA subsidy $ 14M t $17M (57% subsidy rate) Ttal Cst t ADC $10.65M t $12.8M The fllwing items have been included in the abve cst estimate: Rundabut at Chalmers Avenue / Suth Street intersectin Chalmers Avenue extensin New bridge (420m lng this bridge is at a skew t the river, and is lnger than bridges fr ther ptins) New rad t Grve Street / Carters Terrace intersectin Recnstructin f Grve Street Allwance fr minr wrks ($100k) n Graham Street near Tinwald Schl (see nte 5 belw) Land acquisitin csts The fllwing items have been excluded frm the abve cst estimate: Upgrades t Chalmers Avenue nrth f Suth Street - Rad has adequate capacity & already carries significant traffic vlumes Upgrades t Bridge Street Upgrade is planned independent f this prject Upgrades t intersectins f lcal rads with State Highway 1 see nte 2 belw Upgrades t Carters Terrace, Wilkins Rad, Jhnstne Street & Grahams Rad between new rad and existing urban area. - It is assumed that this wrk will be dne in cnjunctin with future residential develpment n these streets. This ptin is identical t the Chalmers Avenue t east f Tinwald (Rural) ptin nrth f the river. It is als similar t that ptin suth f the river, except that this ptin will include a new urban rad between the river and the intersectin f Carters Terrace and Grve Street, and wuld cntinue alng Grve Street t Graham Street. Mst f the effects f this ptin will be the same as thse f the Chalmers Avenue t east f Tinwald (Rural) ptin. Only thse effects which differ frm that ptin have been cnsidered belw. Traffic Effects This is an urban rute with 50km/h perating speeds thrughut. It is therefre likely t attract less thrugh traffic between SH1 suth f Ashburtn and nrth-eastern Ashburtn than the Chalmers Avenue rural ptin This ptin will result in a significant increase in traffic n Grve Street. Grve Street is classified in the District Plan as a lcal rad. Traffic mdelling indicates that traffic n Grve Street will increase frm 600 t 700 vpd t 10,000 t 15,000 vpd adjacent t Carters Terrace. Much f this is expected t dissipate dwn Wilkin, Manchester, Jhnstne, Agnes, and Graham Streets. Traffic vlumes n these streets are expected t increase as a result f any residential develpment 43

50 Chalmers Avenue t Grve Street arising frm the prpsed District Plan review changes t Residential C and D east f Tinwald. Much f the traffic which currently uses these streets t access SH1 t travel acrss the river is expected t use the new rute. These streets are therefre likely t experience an increase in traffic near Grve Street, and a slight reductin near SH1. Grve Street will be widened and strengthened t cpe with the additinal traffic vlumes. It is intended that the final rad and intersectin layuts will be decided fllwing inputs frm lcal residents. A 17m wide carriageway plus tw 1.5m wide ftpaths can be accmmdated in the existing 20m wide rad reserve. This wuld prvide the fllwing: 2m wide painted flush median; Tw 3.2m wide vehicle lanes (ne each way); 1.8m wide cycle lanes each side 2.5m wide parking each side 1.5m wide ftpath each side This layut meets the minimum standards fr a significant urban rad, but is less than the current desirable standards, and there is n rm fr landscaping r grassed berms. It is likely t result in a functinal, but cnstrained, rad envirnment. Additinal lane widths culd be prvided by restricting parking t ne side, prviding staggered parking bays, r mitting the flush median. Effects n Prpsed Riverview Retirement Village This ptin wuld require a significant area f land frm the prpsed site f the retirement village (n Carters Terrace, ppsite Grve Street). This may affect the viability f the retirement village at this lcatin. Amenity Effects This ptin is likely t have significant negative impacts n the existing residential amenity f Grve Street. These impacts will be felt by a large number f existing dwellings ver the length f Grve Street, but particularly near Carters Terrace. The cnstraints assciated with fitting a majr rad int an existing 20m wide rad reserve limit the ptins available t mitigate these effects. Nise Effects A preliminary nise assessment has been carried ut n the Grve Street ptin. This assessment cncludes that, with quiet rad surfacing (such as Asphaltic Cncrete), it is likely that the nise generated by the expected traffic vlume n Grve Street will just meet the NZTA acustic guidelines. Hwever, this is a significant change frm the traffic nise levels currently experienced in Grve Street. The full preliminary nise assessment is included in Appendix D. Air Quality Effects It is likely that any changes in air quality as a result f this ptin will be similar t thse as a result f the rural ptin, but will affect many mre existing dwellings alng Grve Street. Vibratin Effects Lwer traffic speeds are likely t result in an verall reductin in vibratin effects when cmpared t the rural ptin, but as nted in the air quality sectin, these will affect many mre existing dwellings 44

51 Chalmers Avenue t Grve Street Visual Effects The visual effects will be similar t the rural ptin apart frm the Grve Street streetscape, which is cvered in the sectin belw. Streetscape Effects The Grve Street streetscape currently cnsists f a 14m wide carriageway with 3m wide ftpaths in sme lcatins, and 1.5m wide ftpaths and 1.5m wide grass berms in ther lcatins. As nted abve, the cnstraints assciated with fitting a majr rad int the existing 20m wide rad reserve limit the ptins available t mitigate effects and t prvide a streetscape that reflects the level f amenity that wuld be expected. The finished Grve Street streetscape wuld need t be decided fllwing inputs frm Grve Street residents. Optins t imprve the streetscape culd include: Staggered parking bays with alternating parking bays and landscaped berms n each side f the rad. Parking wuld nt be available utside at least 50% f the prperties in Grve Street under this scenari; Limiting parking t ne side nly and prviding a 1.25m wide landscaped berm n bth sides f the rad. Parking wuld nt be available utside at least 50% f the prperties in Grve Street under this scenari als; Nt prviding a flush median, and prviding a 1.0m wide landscaped berm n each side. This has ptential safety impacts with vehicles stpping in the thrugh lane t turn right int private prperties. Prviding a 3.0m wide cmbined parking and cycle lane, with a 3.5m wide vehicle lane, and a 1.0m wide landscaped berm. Hwever, even with a small number f vehicles parked n the rad, cyclists will need t enter a reasnably busy traffic lane t pass parked vehicles. This is a ptential safety hazard fr cyclists. Prperty Effects This ptin wuld require the acquisitin f land frm 4 prperties, including thse assciated with the River View Retirement Village. Severance effects n individual prperties assciated with this cmplex are small. Hwever, the Retirement Village wns adjacent prperties n either side f the prpsed alignment. This is likely t result in significant severance effects n the cmplex as a whle. Relatinship t Other Transprtatin Study Prjects This ptin is expected t prvide significant relief t traffic cngestin thrugh central Ashburtn. Therefre, there is likely t be sme inter relatinship between the prjects t imprve capacity thrugh Ashburtn (fur laning f S1 between Havelck Street and Mre Street, Dbsn Street / Kermde Street / SH1 intersectin, and Walnut Avenue / SH1 / East Street intersectins), and this 2 nd bridge ptin. Advancing the State Highway prjects plus the traffic signals in Tinwald wuld be likely t enable the secnd bridge between Chalmers Avenue and east f Tinwald t be delayed. Cnversely, advancing the secnd bridge wuld be likely t allw the State Highway prjects in central Ashburtn t be delayed, and pssibly negate the need fr traffic signals in Tinwald. The majrity f any safe pedestrian and cycle rutes t schls wuld be separate frm the secnd bridge prject, apart frm the sectin acrss the Ashburtn River. This sectin is 45

52 Chalmers Avenue t Grve Street discussed belw. Inclusin f pedestrian and cycle facilities n this rute wuld be able t be linked t pedestrian and cycle rutes t Ashburtn Intermediate and Ashburtn Cllege. This wuld be a particular advantage t pupils f these schls living in eastern areas f Tinwald. The Chalmers Avenue t east f Tinwald (rural) rute is likely t imprve pedestrian and cycle facilities acrss the Ashburtn River. The prvisin f sme pedestrian and cycle facilities alng Grve Street will prvide a reasnably safe and cnvenient pedestrian and cycle rute t and frm eastern Tinwald. Hwever, this rute wuld be less cnvenient fr pedestrians and cyclists in the western and, t a lesser extent, central, areas f Tinwald. Cnsequently a prject t upgrade pedestrian and cyclist facilities n r near the existing bridge wuld be likely t be required in cnjunctin with this prject. The prvisin f cycle and pedestrian facilities alng Grve Street may be able t be linked t a pedestrian and cycle rute t Tinwald Schl. This rute may mre apprpriately use lw vlume lcal rads such as Thmsn Street. Cmments / Ntes 1. Lcal NZTA staff have indicated that this ptin wuld be likely t be ne f the ptins which mst effectively address the transprtatin issues in Ashburtn. They wuld therefre be likely t supprt a funding applicatin fr this ptin assuming all ther funding criteria were met. 2. Maintenance f this ptin wuld be the respnsibility f ADC. Maintenance f the existing SH1 rute alng West Street and Archibald Street (including the existing bridge) wuld the respnsibility f NZTA. 3. NZTA funding is pssible fr this ptin. 4. Because this ptin prvides significant benefits t SH1, it may be pssible t get additinal funding frm NZTA fr this ptin (ver and abve the 57% subsidy). This will need t be negtiated with NZTA, and has nt been included in the NZTA subsidy abve. 5. This ptin addresses the fllwing key issues: a. Rad safety thrugh Tinwald, and fr pedestrians and cyclists crssing the river b. Future cngestin n the existing bridge and assciated rad netwrk. c. Accessibility between Tinwald and key destinatins within twn d. Rute security if the existing bridge is clsed. 6. The cmmunity Reference Grup prduced the fllwing list f Prs and Cns fr this ptin. Prs Uses existing rads Shrtest rute Pssibly cheapest ptin Fewer prperties needed in purchase NZTA funding pssible Cns Mre cst with lnger bridge Residential street Width f rad fr parking and pedestrians Heavy traffic suth bund in residential street Safety fr residents 46

53 Chalmers Avenue t Grve Street Lcal traffic wuld use it frm belw the main rad Nise Significant reductins in traffic n existing bridge Pllutin Increase in Tinwald -Ashburtn utility cnnectin Prperty devaluatin Assists West Street intersectin issues N exit ptin n t Graham Street; cntrls at Grahams Rad and Grve Street Impact n Tinwald Schl N cmpensatin t Grve Street residents Impacts n many Tinwald residents Severance f Grve Street frm side t side Grve Street nt wide enugh fr mdern design f high vlume traffic Trucks frm bundary Rad crusher plant wuld use Grve Street t get t retail yards T clse t Scut Park Prevents develpment f the Rest hme 47

54 West Street t Melcmbe Street (rail level crssing) 13 West Street t Melcmbe Street (rail level crssing) Descriptin New State Highway n fllwing rute: Extensin f State Highway 1 (West Street) frm Mre Street t river New river crssing New link frm river t Melcmbe Street Melcmbe Street Marnan Rad New curved cnnectin t rail level crssing suth f Laings Rad New curved cnnectin t State Highway suth f Thews Rad East Street t be upgraded between Mre Street and Walnut Avenue as fllws: Intersectin upgrades at Mre Street, Havelck Street & Walnut Avenue Remval f pedestrian platfrms and traffic calming. Refer ntes 1-4 belw fr discussin f ptin f encuraging traffic t use West Street rather than East Street. All Existing rail crssings in Tinwald t be clsed (refer Nte 4 belw) New rail level crssings and signalised intersectins at the Graham Street / Shearer Street and at Wilkin Street / Millichamp Street intersectins with Archibald Street and Melcmbe Street. Design Standards The cncept design and cst estimates fr this ptin are based n the fllwing minimum design standards: Design speed f 60km/h n urban sectins and 110km/h n rural. State Highway design speeds are typically 10km/h higher than the psted speed limit in flat pen terrain. This prvides a margin f safety fr the large number f mtrists wh travel up t 10km/h abve the speed limit; Rad crss sectin with the fllwing features (4 lane sectin f SH1 Walnut Avenue t Mre Street) Slid median 2 x 3.5m traffic lanes bth sides 1.8m cycle lane bth sides 2.5m parking bth sides Kerb & channel bth sides 2.5m ftpath west side 1.5m ftpath east side 5m berm / strmwater treatment east side 40m rad reserve 48

55 West Street t Melcmbe Street (rail level crssing) Rad crss sectin with the fllwing features (urban sectin Mre Street t Marnan Rad): Flush median 3.5m traffic lane bth sides 2.5m parking west side Kerb & Channel west side 1.5m ftpath west side Strmwater swale east side Pssible ff rad cycle path and ftpath between rad and railway 28m wide rad reserve Rad crss sectin with the fllwing features (rural sectin Marnan Rad t Link with State Highway): 3.5m traffic lane bth sides 2.0m sealed shulder bth sides this prvides adequate rm fr cyclists t travel clear f the traffic lane Strmwater cllected in swales n bth sides 24m rad reserve 30m stacking distance between railway and intersectins at railway level crssings t allw a car and a truck t stp clear f bth the railway line and the thrugh rad. Rad t crss railway at a maximum f 20 deg either side f a right angle (i.e. between 70 and 110 degrees) First curve at end f lng pen rad straight suth f Tinwald t be a high speed flwing curve with 110km/h design speed. Design speed f subsequent curves t be reduced in 15km/h increments (i.e. 2 nd curve t be 95km/h, 3 rd curve 80km/h etc) These are cnsidered the abslute minimum current standards fr new rad cnstructin fr a majr State Highway. Higher design standards have been adpted fr the Rads f Natinal Significance. If this sectin f SH1 is cnsidered t fall under that categry, then thse higher standards may apply. Rugh Order f Cst Estimate Cnstructin Cst $31M t $37M Land Acquisitin $5.2M t $6.4M Ttal Cst $36.1M t $43.4M Assumed NZTA subsidy $ 0 t 0 $ Ttal Cst t ADC $36.1M t $43.4M The fllwing items have been included in the abve cst estimate: 49

56 West Street t Melcmbe Street (rail level crssing) Widening f West Street (SH1) between Mre Street and Walnut Avenue New link between Mre Street and river New bridge (360m lng) New rad t Melcmbe Street Recnstructin f Melcmbe Street New rail level crssings and signalised intersectins Recnstructin f Marnan Rad New curved alignment acrss railway line t cnnect t State Highway Land acquisitin csts Minr imprvements n East Street The fllwing items have been excluded frm the abve cst estimate: Fur laning between Mre Street and Havelck Street and assciated intersectin upgrades. These upgrades have been identified in the Ashburtn Transprtatin Study as pssibly being required regardless f which bridge ptin prgresses. The transprtatin study recmmends further investigatins int this ptin; Widening f West Street between Walnut Avenue and Racecurse Rad. This may be required at sme stage in the future; and Upgrade f level crssing fr Plains Histric Railway. Refer cmments belw n this level crssing. Traffic Effects This rute will be a cmbinatin f urban (50km/hr perating speed) thrugh the Ashburtn urban area and rural (100km/hr perating speed) beynd the urban area t the link with the existing State Highway. It will becme the new SH1, and be designed and cnstructed t the apprpriate NZTA State Highway standards. Archibald Street thrugh Tinwald will becme a lcal rad. Under this ptin the vast majrity f existing thrugh traffic n SH1 is likely t use Melcmbe Street rather than Archibald Street. This State Highway thrugh traffic includes a high prprtin f heavy vehicles. NZTA tube cunts indicate that 18% f the ttal daily traffic n the State Highway at Winslw, n weekdays during the week f 10 th t 17 th January 2008 was heavy vehicles. 48% f the traffic between 10:00pm and 6:00am, and 67% between 2:00am and 4:00am was heavy vehicles. A full hurly breakdwn f the percentage f heavy vehicles n SH1 suth f Wills Street, suth f the Ashburtn River Bridge, and at Winslw is included in Appendix C. Lcal traffic between west Tinwald and nrth-western Ashburtn is likely t use the new State Highway n Melcmbe Street. Lcal traffic between east Tinwald and nrth-eastern Ashburtn is likely t use Archibald Street. Lcal traffic between west Tinwald and nrth-eastern Ashburtn, and between east Tinwald and nrth-western Ashburtn is likely t be split between the tw rutes. Under this ptin, it is expected that traffic vlumes n Melcmbe Street, suth f Buckleys Terrace will increase frm 500 vpd t between 10,000 and 15,000 vpd. Archibald Street vlumes are expected t decrease frm 20,000 vpd t between 5,000 and 10,000. Relcating the State Highway t Melcmbe Street and a new bridge west f the existing rail bridge will prvide relief t traffic cngestin n Archibald Street and the existing bridge. Hwever, it will 50

57 West Street t Melcmbe Street (rail level crssing) nt address the grwing traffic vlumes n SH1 nrth f Mre Street. Three ptins have been identified t address this traffic, namely: 1. Widen SH1 between Mre Street and Walnut Avenue t accmmdate fur lanes plus parking and a slid median; 2. Prvide fur lanes within existing carriageway width this wuld require the remval f parking n bth sides f the rad, remval f the flush median, and prhibitin f right turns int and ut f Burnett Street, Tancred Street West Street carpark, and accesses t businesses; r 3. Encurage traffic between Tinwald and nrth east Ashburtn t use East Street by remving existing speed platfrms n East Street and reducing cnflict between parking vehicles and thrugh traffic by either remving parking r widening East Street. It was cnsidered that the ttal lss f parking n SH1 r significant increase in traffic n East Street wuld have severe adverse effects n adjacent businesses and amenity, and were nt cnsidered further. Even with an increased capacity n SH1, the clsure f the existing State Highway level crssing suth f Mre Street is still likely t result in mre lcal traffic between Tinwald and nrth-eastern Ashburtn using East Street rather than turning left nt Mre Street, crssing the railway line, turning right nt West Street (SH1), and then turning right and again crssing the railway line at either Havelck Street, Walnut Avenue, East Street r Nrthpark Rad. This increased traffic vlume n East Street is likely t have negative impacts n amenity values n East Street and result in increased cnflicts and accidents between thrugh traffic and traffic accessing car parking. The intersectin f Mre Street with bth West Street and East Street wuld require significant upgrades t cpe with the significant additinal traffic crssing the railway line at that pint. There is very little rm fr large vlumes f right turning traffic t queue clear f the railway line at either West Street r East Street. Melcmbe Street is clse t the railway at the lcatins f the existing level crssings. There is inadequate rm fr vehicles t wait at these intersectins clear f the railway. It is therefre prpsed t replace these level crssings with crssings in lcatins where there is mre rm between Melcmbe Street and the railway. Cnverting Melcmbe Street int SH1 is likely t result in a significant increase in traffic (including heavy vehicles) thrugh the existing rail underpass ppsite Carters Terrace. This structure is currently t lw fr heavy vehicles. Lwering the rad under the railway t achieve adequate headrm wuld require lwering bth Melcmbe Street and Archibald Street. This wuld have flw n effects n Carters Terrace and n accesses t private prperties in the vicinity. Similarly, raising the rad t enable a level crssing at this lcatin wuld require raising f bth Melcmbe and Archibald Streets, with similar impacts n Carters Terrace and private accesses. It is therefre prpsed that the underpass be frmed int a pedestrian and cycle rute. Cnsequently the clsure f the existing underpass t traffic, and its cnversin t a pedestrian and cyclist facility has been included in this ptin. The Plains Histric Railway branch line crsses Melcmbe Street near the intersectin f Bryant Street & Ann Street. Significant wrk wuld be required t bring this rail crssing up t a standard suitable fr SH1. This wuld include significant prperty purchase t enable the new State Highway t crss the railway line at n less than 70 degrees. This is nt cnsidered justified fr 51

58 West Street t Melcmbe Street (rail level crssing) the small number f train mvements at this lcatin. It is recmmended that an ptin f implementing a temprary traffic management plan fr train mvements be cnsidered. This wuld likely invlve restricting Histric Railway mvements acrss Melcmbe Street t times f lw traffic vlumes, and the use f Stp / G paddles t stp State Highway traffic fr train mvements n this line. This apprach wuld require agreement f NZTA, KiwiRail, and the Plains Histric Railway. The intersectin f Bryant Street and Ann Street with Melcmbe Street is unsuitable fr the increased traffic vlumes assciated with SH1, particularly s clse t the branch line rail crssing (albeit a rarely used crssing). Prviding an acceptable apprach angle fr either f these intersectins wuld require the acquisitin f significant private land. It is therefre recmmended t link Bryant Street and Ann Street, and clse the intersectin with Melcmbe Street. The layut f the prpsed rail level crssing suth f Tinwald is designed t meet current State Highway design standards. The first curve encuntered by nrthbund traffic at the end f a lng high speed straight will have a design speed f 110 km/h. Such curves at the end f lng high speed straights typically experience cmparatively high numbers f high speed lss f cntrl type crashes. Because f the high speeds invlved these crashes are ften serius. Rad Safety This rute is likely t result an imprvement in rad safety n SH1 in Tinwald as a result f the reductin in thrugh traffic making it easier fr lcal traffic turning acrss and nt Archibald Street. It als prvides a safer rute fr cyclists and pedestrians acrss the river than the existing. Hwever, as nted abve,, it als likely t result in an increased risk f severe high speed lss f cntrl crashes at the reverse curves at the end f the lng high speed straight suth f Tinwald. Amenity Effects This ptin significantly increases the vlume f traffic, including a large prprtin f heavy vehicles, n Melcmbe Street. At the same time it reduces traffic vlumes n Archibald Street. There are likely t be significant negative impacts n residential amenity values n Melcmbe Street, and crrespnding psitive impacts n Archibald Street. There are mre cmmercial, and fewer residential prperties n Archibald Street than n Melcmbe Street. Therefre the psitive impacts are likely t affect fewer dwellings than the negative nes. Melcmbe Street, frm Lagmhr Rad t the railway crssing suth f Manchester Street is classified as a Cllectr Rad in the Ashburtn District Plan. This sectin carries apprximately 1000vpd. The remainder f Melcmbe Street is classified as a Lcal Rad, and carries between 500 and 2000 vpd. Nise Effects This ptin is expected t have little impact n traffic vlumes n SH1 nrth f Mre Street. It is therefre als expected that the nise effects n prperties adjacent t this sectin f rad wuld be minimal. There is likely t be sme increase in traffic, and a crrespnding increase in nise levels n East Street. The majrity f prperties adjacent t East Street are cmmercial prperties with few, if any residential prperties. The effects f that increase in nise levels are therefre expected t be small. 52

59 West Street t Melcmbe Street (rail level crssing) The nise generated by traffic n SH1 and by the railway already affects dwellings n Melcmbe Street. Mving the SH1 frm its present lcatin t Melcmbe Street will result in thse nise surces being much clser t the dwellings n Melcmbe Street. This will have significant nise impacts n thse dwellings. Traffic nise is generally perceived as mre nticeable at night than during the day, and heavy vehicles make a majr cntributin t traffic nise. As nted abve, a very high prprtin f the thrugh vehicles n SH1 during the night are heavy vehicles. This wuld result in greater nise impacts n Melcmbe Street dwellings than wuld be the case if the increase in traffic was made up f lcal traffic. Air Quality Effects Changes in air quality are related t the additinal vlume f traffic. Relcating SH1 t Melcmbe street is likely t result in air quality effects assciated with the State Highway traffic als relcating frm Archibald Street t Melcmbe Street. Increasing traffic vlumes n East Street may result in sme deteriratin in air quality n East Street. Vibratin Effects Vibratin effects are usually assciated with bth the vlume f traffic, the number f heavy vehicles using the rute, and the rughness f the rad surface. The rad surface n the widened sectin f SH1 between Mre Street and Walnut Avenue will be a high quality smth surface. This will reduce the vibratin effects ver this sectin Melcmbe Street will be subject t a significant increase in traffic, particularly heavy vehicles travelling at night. This has the ptential t result in an increase in vibratin effects felt at the dwellings n Melcmbe Street. Hwever, Melcmbe Street will be widened and strengthened t urban State Highway standards. This will result in a gd quality smth surface, which may mitigate sme f the vibratin effects here. Visual Effects The fur laning f SH1 nrth f Mre Street will result in sme visual effects n this sectin as a result f this ptin. There will be a ptential visual effect assciated with a new bridge acrss the Ashburtn River in this lcatin. The clse prximity f the existing rad and rail bridges will largely mitigate that effect. The Melcmbe Street sectin will have a visual effect due t the wider carriageway and upgraded intersectins that will be required. The cnstructin f a new sectin f rad lping between the Melcmbe Street / Marnan Rad intersectin, acrss the railway line and linking t SH1 will result in sme visual effects in this area. Streetscape Effects SH1 between Mre Street and Walnut Avenue is bund n ne side by the Main Suth railway Line (MSL), and by cmmercial prperties n the ther. A fur lane urban state highway will change the streetscape here, but is nt incnsistent with this envirnment. Melcmbe Street is bund n ne side by the railway, and largely by residential prperties n the ther. An urban state highway will result in a significant change t the streetscape in this lcatin. 53

60 West Street t Melcmbe Street (rail level crssing) Sme f the effects f that change will be mitigated by the fact that part f Melcmbe Street is currently classified as a Cllectr rad, and that it is lcated n ne side f an existing majr transprtatin crridr. The new sectin f State Highway suth f Marnan rad will have a rural type crss sectin which includes grass berms / swale drains. This will be generally cnsistent with the ther rural rads in the vicinity. Therefre, it will nt be ut f place within this envirnment. Prperty Effects This ptin wuld require the acquisitin f land frm 21 prperties. Severance effects are likely due t the curves acrss the railway line at the suth end f Tinwald. It is pssible that ne r tw hmes may need t be demlished t accmmdate these curves. Cmments / Ntes 1. The appraches t the level crssing at the suth f Tinwald include very large curves in this ptin. Current State Highway design standards require a number f features which have cntributed t the design f these curves. These include: a. The angle between a rad and railway at a level crssing shuld be between 70 and 120 degrees b. Curves at the end f lng high speed straights (such as the ne suth f Tinwald) shuld have an abslute minimum design speed f 110km/h. This will reduce (but nt eliminate) the incidence f high speed lss f cntrl crashes when cmpared t mre severe curves. c. The design speeds f subsequent curves are t reduce by n mre than 15km/h at each curve. This enables drivers t prgressively slw dwn as they prceed thrugh a series f curves. Cnsequently the design speeds fr the nrthbund curves at the end f the straight entering Tinwald are t be: First curve (right hand at end f straight) 110km/h Secnd curve (left hand befre rail crssing) 95km/h Third curve (right hand after rail crssing) 80km/h Furth curve (left hand t rejin Melcmbe Street) 65km/h 2. Lcal NZTA staff have indicated that this ptin wuld be less effective at addressing the transprtatin issues in Ashburtn than ther ptins cnsidered, and is mre expensive than thse ptins. It wuld therefre be unlikely t btain funding frm NZTA. 3. Maintenance f this ptin wuld be the respnsibility f NZTA if the ptin were t becme a SH1. Maintenance f the existing SH1 rute alng West Street and Archibald Street (including the existing bridge) wuld then becme the respnsibility f ADC. 4. NZTA funding is unlikely fr this ptin. 5. This ptin addresses the fllwing key issues: 54

61 West Street t Melcmbe Street (rail level crssing) 6. Rad safety thrugh Tinwald, and fr pedestrians and cyclists crssing the river 7. Future cngestin n the existing bridge and assciated rad netwrk. 8. The cmmunity Reference Grup prduced the fllwing list f Prs and Cns fr this ptin. Prs East Tinwald easier access t rads Cns Majr urban impact (i.e. within Ashburtn) Bth ptins have least sci-ecnmic effect n current and future residents Result in minimum cngestin in the urban areas (cngestin f cycles, cars, students) Shrtest rute fr traffic Least cstly as cuncil wned???? wh des wn it? Cuncil? Rail? Favured by trucks??? wh says it is the truckies? Or wh Scut park unaffected Allws fr rest hme develpment Lss f green urban area Splits Ashburtn and Tinwald in tw Des nt slve traffic issues between bridge and Walnut Avenue Rail reserve area affected Need cntrlled lights Cstly extensins t West Street Cncerned abut the high-speed crners prpsed near Marnan Rad and several sprts facilities (veldrme, playing fields) Length f rm between railway line and rads, turning bays, verpass Future limited fr freight mvement Less appeal t cyclists and pedestrians Established businesses n Archibald Street n lnger expsed t SH1 traffic Trucks frm Bundary Rad crusher plant will still use Grahams Rad t access Archibald Street Traffic frm rural east f Tinwald [ including Lake Hd] have t g thrugh existing urban area [ mstly Grahams Rad] 55

62 West Street t Melcmbe Street (rail verpass) 14 West Street t Melcmbe Street (rail verpass) Descriptin This rute is identical t the West Street t Melcmbe Street (rail level crssing) rute except that the curved alignment and rail level crssing between Marnan Rad and State Highway 1 is replaced with a rail verpass (rad passes ver the rail) between Marnan Rad and Laings Rad. The design standards and Ntes / Cmments belw nly reflect thse areas where this ptin differs frm the level crssing ptin. Design Standards The cncept design and cst estimates fr this ptin are based n the fllwing minimum design standards: As per rail level crssing ptin plus KiwiRail minimum clearance frm structures. Rugh Order f Cst Estimate Cnstructin Cst $32M t $39M Land Acquisitin $5.6M t $6.9M Ttal Cst $37.6M t $45.9M Assumed NZTA subsidy $ 0 t $ 0 Ttal Cst t ADC $37.6M t $45.9M The fllwing items have been included in the abve cst estimate: As per the rail level crssing ptin except that the sectin frm Marnan Rad t State Highway is replaced with new rad and verpass structure Traffic Effects The layut f the prpsed rail verpass suth f Marnan Street is designed t meet current State Highway design standards. The first curve encuntered by nrthbund traffic at the end f a lng high speed straight will have a design speed f 110 km/h, and be n an incline. Such curves at the end f lng high speed straights typically experience cmparatively high numbers f high speed lss f cntrl type crashes. Because f the high speeds invlved these crashes are ften serius. Amenity Effects The amenity effects f this ptin are expected t be little different t the level crssing ptin. 56

63 West Street t Melcmbe Street (rail verpass) Nise Effects Vehicles (particularly heavy vehicles) are likely t generate mre engine nise when climbing ver the rail verpass than when n flat level terrain. This nise is likely t be mre nticeable when the vehicles generating it are abve the surrunding grund levels. The high prprtin f heavy vehicles at night at this lcatin is likely t result in an increase in night time nise levels. Cnsequently, this ptin is likely t result in negative nise effects in the vicinity f the verpass. Hwever, there are currently relatively few dwellings in this lcatin likely t be affected Air Quality Effects The air quality effects are likely t be little different frm the effects f the level crssing ptin. Vibratin Effects Vibratin effects are expected t be little different frm the effects f the level crssing ptin Visual Effects The presence f a 6m high verpass and assciated apprach rads will have a significant visual impact n the generally flat rural envirnment suth f Marnan Rad. Streetscape Effects The streetscape f the radway ver the verpass and assciated apprach rads will take the frm f an elevated radway, including guardrails. This is less cnsistent with the existing flat rural rads in the vicinity than the level crssing ptin. Prperty Effects This ptin wuld require the acquisitin f land frm 14 prperties. Sme Severance effects are likely due t the new access nt SH1 frm suth Tinwald. Cmments / Ntes 1. As per the rail level crssing ptin 57

64 4 Laning f State Highway Laning f State Highway 1 Descriptin Widen the existing State Highway t fur lanes ver its existing rute between Walnut Avenue and the edge f the Tinwald urban area. A secnd bridge t be built adjacent t the existing bridge. The new State Highway t pass ver the railway line suth f Mre Street via an verpass. Design Standards The cncept design and cst estimates fr this ptin are based n the fllwing minimum design standards: Design speed f 60km/h n urban sectins; Rad crss sectin with the fllwing features (4 lane sectin f SH1 Walnut Avenue t Mre Street) Slid median 2 x 3.5m traffic lanes bth sides 1.8m cycle lane bth sides 2.5m parking bth sides Kerb & channel bth sides 2.5m ftpath west side 1.5m ftpath east side 5m berm / strmwater treatment east side 40m rad reserve 30m stacking distance between railway and intersectins at railway level crssings t allw a car and a truck t stp clear f bth the railway line and the thrugh rad. If rad crsses railway at a level crssing, then rad t crss at a maximum f 20 deg either side f a right angle (i.e. between 70 and 110 degrees) These are cnsidered the abslute minimum current standards fr new rad cnstructin fr a majr State Highway. Higher design standards have been adpted fr the Rads f Natinal Significance. If this sectin f SH1 is cnsidered t fall under that categry, then thse higher standards may apply. Rugh Order f Cst Estimate Cnstructin Cst $37M t $46M Land Acquisitin $4M t $5M Ttal Cst $41M t $51M Assumed NZTA subsidy $ 0 t $ 0 58

65 4 Laning f State Highway 1 Ttal Cst t ADC $41M t $51M The fllwing items have been included in the abve cst estimate: Widening f West Street (SH1) between Walnut Avenue and Mre Street New verpass ver railway line between Mre Street and river Clsure f Dbsn Street, Kermde Street and West Street, west f SH1, and East Street east f SH1. New link between Dbsn Street and Kermde Street at Park Street New bridge (360m lng) Widening f Archibald Street (SH1) between river and edge f Tinwald urban area New rail level crssings and signalised intersectins Land acquisitin csts The fllwing items have been excluded frm the abve cst estimate: Fur laning between Mre Street and Havelck Street and assciated intersectin upgrades. These upgrades have been identified in the Ashburtn Transprtatin Study as pssibly being required regardless f which bridge ptin prgresses. The transprtatin study recmmends further investigatins int this ptin. Widening f West Street (SH1) between Walnut Avenue and Racecurse Rad. This may be required at sme stage in the future. Traffic Effects This rute will be an urban fur lane state highway between Walnut Avenue and Graham Street. It will have a 50km/h perating speed thrugh the urban area. It is als expected that an extensin f the fur lane sectin beynd Walnut Avenue t Racecurse Rad at sme stage further in the future. An ptin f maintaining a level crssing fr SH1 suth f Mre Street was cnsidered. Hwever, a new fur lane State Highway wuld need t meet the current design standard f an apprach angle nt exceeding 20 deg frm perpendicular t the railway. In rder t meet this standard, and maintain a 60 km/h design speed fr the apprach curves, the purchase f significant areas f private prperty, and the demlitin f a number f cmmercial buildings in the vicinity f the intersectins f SH1 with Mre and Suth Streets wuld be required. It was cnsidered that the csts invlved in acquiring the land, including cmpensatin fr a number f substantial cmmercial buildings wuld far exceed the additinal cst f a rail verpass. The level crssing ptin was therefre nt cnsidered any further. A rail verpass, and assciated appraches prevents access between SH1 and East Street, Dbsn Street and Suth Street n east, and West Street, Dbsn Street, and Kermde Street n east side f SH1. The current standard fr majr fur lane rads is t have a slid central median t separate ppsing traffic flws. This wuld effectively limit the access int minr side rads and all private 59

66 4 Laning f State Highway 1 prperties, including businesses, alng the fur lane sectin, between Walnut Avenue and Graham Street, t left in, left ut nly. Under this ptin, all traffic crssing the Ashburtn River will use the widened existing rute. Traffic which currently uses the East Street / SH1 intersectin wuld need t crss the new rail verpass, and access eastern Ashburtn via Mre Street, Havelck Street, Walnut Avenue, Seafield Rad r Nrthpark Rad. This will place additinal pressure n the intersectins f SH1 and East Street with Mre Street, and t decreasing extents with the ther streets mentined abve. There is limited rm between the railway line and SH1 and East Street t prvide safe stacking distance fr increased numbers f vehicles stpped at these traffic signals t be clear f the railway line. Traffic which currently accesses SH1 frm West Street (including Dbsn and Kermde Streets west) wuld need t use Park Street and Mre Street under this ptin. A new link between Dbsn Street and Kermde Street wuld als need t be prvided. The maximum gradient n the verpass appraches is expected t be in the vicinity f 5%. Light vehicles are expected t cpe with that gradient cmfrtably. Heavy vehicles which enter the gradient at 50km/h are expected t maintain that speed ver the cmparatively shrt length f gradient. Sme fully-laden heavy vehicles which start frm a standstill at the base f the gradient may struggle t accelerate beynd a crawl speed until they are ver the tp f the gradient. This may result in delays and frustratin fr fllwing vehicles. Rad Safety The railway verpass wuld prvide imprved safety cmpared t the existing level crssing. Hwever, there are likely t be negative safety effects assciated with vehicles and pedestrians crssing fur lanes f traffic. Effects n Schls The nly expected changes in traffic patterns assciated with this ptin are related t the rad clsures assciated with the rail verpass and appraches. This is likely t result in additinal traffic using the Park Street / Mre Street intersectin ppsite the Ashburtn Brugh Schl as a result f this ptin. Amenity Effects This ptin has little impact n traffic vlume r distributin alng SH1. Cnsequently there are likely t be few impacts due t increased traffic vlumes alng the State Highway arising frm this ptin. There are, hwever likely t be changes in amenity in the area between Mre Street and the bridge due largely t the 6m high rail verpass and appraches, and t the changes in traffic distributin resulting frm the inability f lcal rads t access SH1 ver that length. 60

67 4 Laning f State Highway 1 Nise Effects There is likely t be little change in traffic generated nise effects ver mst f the fur laned sectin f SH1. Hwever, vehicles climbing the gradient t crss the railway verpass are likely t generate higher levels f engine nise than vehicles n a flat surface. This is particularly true f heavy vehicles which are climbing the gradient frm a standstill (such as vehicles stpped at the Mre Street signals). The elevated nature f the verpass is als likely t make such nise mre nticeable than that generated by vehicles n a flat gradient. This area is currently subject t significant traffic nise, including vehicles accelerating away frm traffic signals, and nise frm the railway. Furthermre, the area is surrunded by cmmercial prperties, which tend t be less sensitive t nise effects than residential prperties. There is ptential fr sme change in nise effects n Park Street, Mre Street, and East Street as a result f the redistributin f traffic accessing SH1. As nted abve, Mre Street and East Street are lcated in reasnably nisy envirnments, and are surrunded by cmmercial prperties. Park Street, hwever is in a quieter envirnment, and has dwellings n the west side f the rad, and is adjacent t Ashburtn Brugh Schl n the nrth t nrth-western side f the Park Street / Mre Street intersectin. Air Quality Effects This rute has little effect n verall traffic vlume and distributin, apart frm changes t access between minr rads and SH1 between Mre Street and the bridge. Traffic frm minr rads t the east f SH1 is likely t remain in the same general area as present. Traffic frm minr rads t the west is likely t use Park Street. There is therefre a ptential fr a small reductin in air quality in the Park Street area as a result f this ptin. There is expected t be little ther change in air quality resulting frm this ptin. Vibratin Effects Remving the existing rail level crssing, and prviding a new fur lane rad with smth surfacing is likely t reduce the vibratin effects n the existing State Highway rute. Increasing the traffic vlumes (particularly heavy vehicles accessing the cmmercial areas suth f Mre Streets) n Park Street is likely t result in an increase in vibratin effects n Park Street. This is likely t affect mainly cmmercial prperties plus a small number f dwellings n Park Street, and Ashburtn Brugh Schl. Visual Effects The fur laning f SH1 thrugh the urban area f Ashburtn will result in sme visual effects as a result f this ptin. There will be a ptential visual effect assciated with a new bridge acrss the Ashburtn River in this lcatin. The clse prximity f the existing rad and rail bridges will largely mitigate that effect. 61

68 4 Laning f State Highway 1 The presence f a 6m high verpass and assciated retaining walls and apprach rads will have a substantial visual impact n the n the area between Mre Street and the bridge. Streetscape Effects SH1 thrugh the urban area f Ashburtn is bund n ne side by the Main Suth railway Line. The ther side is bund by cmmercial prperties nrth f the river, and by a cmbinatin f cmmercial and residential prperties suth f the river. A fur lane urban state highway will change the streetscape here, but is nt generally incnsistent with this envirnment. The streetscape f the radway ver the verpass and assciated apprach rads will take the frm f an elevated radway, including guardrails. This is less cnsistent with the existing flat urban rads in the vicinity than the existing level crssing. Prperty Effects This ptin wuld require the acquisitin f land frm 14 prperties. Of these 9 are private prperties, with the remainder in public wnership (either Rail r Cuncil land). Little prperty severance and n demlitin f hmes r cmmercial buildings is identified at this stage. Cmments / Ntes 1. Lcal NZTA staff have indicated that this ptin wuld be less effective at addressing the transprtatin issues in Ashburtn than ther ptins cnsidered, and is mre expensive than thse ptins. It wuld therefre be unlikely t btain funding frm NZTA. 2. Maintenance f this ptin wuld remain the respnsibility f NZTA. 3. NZTA funding is unlikely fr this ptin. 4. This ptin addresses the fllwing key issues: a. Rad safety at the rail verpass b. Future cngestin n the existing bridge and assciated rad netwrk. 5. This ptin was intrduced after the cmmunity Reference Grup prduced their list f Prs and Cns fr the ptins being cnsidered. They have therefre nt had the pprtunity t cmment n this ptin as a grup. 62

69 Traffic Signals In Tinwald 16 Traffic Signals in Tinwald Descriptin This ptin invlves the cnstructin f traffic signals at the Graham Street intersectin with SH1 in Tinwald. It als invlves the cnstructin f a new railway level crssing ppsite Graham Street t jin with Melcmbe Street at the intersectin with Shearer Street. This ptin is nt a lng term ptin fr a secnd bridge acrss the Ashburtn River. It has been included in the assessment fr cmparisn purpses nly. Design Standards The cncept design and cst estimates fr this ptin are based n the fllwing minimum design standards: Austrads intersectin design guidelines 30m stacking distance between railway and intersectins at railway level crssings t allw a car and a truck t stp clear f bth the railway line and the thrugh rad. Rad t crss railway at a maximum f 20 deg either side f a right angle (i.e. between 70 and 110 degrees) Rugh Order f Cst Estimate Cnstructin Cst $0.8M t $1.6M Land Acquisitin $0.2M t $0.4M Ttal Cst $1M t $2M Assumed NZTA subsidy $ 0 t $ 0 Ttal Cst t ADC $0 t $0 The fllwing items have been included in the abve cst estimate: Cnstructin f new signalised intersectin Cnstructin f new railway level crssing and link t Melcmbe Street. Clsure f existing railway level crssing This is nt an ptin which will address the rad capacity issues n SH1 thrugh Ashburtn. It is therefre nt an alternative t a secnd bridge. Rather it is a shrt term ptin t address issues safely and cnveniently accessing SH1 in Tinwald. Traffic Effects Traffic signals at an intersectin in Tinwald will make it easier fr lcal vehicles t enter r crss SH1 at that intersectin particularly at peak times. The gaps in traffic prvided by the signals will als make it easier fr traffic t enter r crss SH1 at adjacent intersectins. 63

70 Traffic Signals In Tinwald Traffic signals are likely t result in delays fr traffic n SH1. At ff peak times signals may result in delays fr turning traffic waiting fr the signals t change cmpared t waiting fr a gap in light traffic vlumes. It is therefre pssible that sme drivers (particularly mre cnfident drivers) may use the signals at peak times, and adjacent intersectins at ff peak times. Traffic signals tend t result in a reductin in crashes invlving turning vehicles, but an increase in nse t tail crashes. As nted in the Chalmers Avenue ptins, the presence f traffic signals in Tinwald may make it easier fr vehicles t access these rutes t and frm SH1. This may result in mre traffic between suth f Ashburtn and nrth-eastern Ashburtn using the Chalmers Avenue rute shuld ne f thse g ahead as well as a signalised intersectin in Tinwald. Amenity Effects The amenity effects resulting frm the installatin f traffic signals at an intersectin in Tinwald are likely t be limited t the area immediately surrunding the intersectin, with the pssibility f sme effects extending t a pssible Chalmers Avenue rute shuld that prceed as well as a signalised intersectin in Tinwald. These effects have been cnsidered in the Chalmers Avenue rute sectins, s will nt be addressed in this sectin. Nise Effects There may be sme increase in nise effects at the signalised intersectin as a result f State Highway thrugh traffic (particularly heavy vehicles) stpping at the signals and accelerating away frm the a standstill Air Quality Effects Traffic signals in Tinwald, n their wn, are expected t have little r n impact n traffic generatin r distributin. It is therefre likely that they will have little r n impact n air quality in Ashburtn. Vibratin Effects Traffic signals in Tinwald, n their wn, are expected t have little r n impact n traffic generatin r distributin. It is therefre likely that they will have little r n impact n vibratin effects in Ashburtn. Visual Effects The presence f traffic signals may have a slight visual effect at the signalised intersectin. They will have little r n impact elsewhere. Streetscape Effects The presence f traffic signals my change the streetscape f the affected intersectin when cmpared t its current layut. Hwever, traffic signals are entirely cnsistent with the streetscape f a majr urban State Highway. 64

71 Traffic Signals In Tinwald Prperty Effects This ptin wuld require the acquisitin f land frm 4 prperties. Cmments / Ntes 1. Maintenance f this ptin wuld be the respnsibility f NZTA. 2. NZTA funding is pssible fr this ptin if it meets NZTA s funding criteria. 3. This ptin addresses the fllwing key issues: a. Rad safety thrugh Tinwald, b. Imprved access t SH1 fr Tinwald mtrists. 65

72 Cmparative Optin Assessment 17 Cmparative Optin Assessment A multi criteria assessment was carried ut n each ptin. The criteria were agreed at a full day wrkshp attended by prject team members frm Opus, Taylr Baines and Assciates, and ADC. A preliminary assessment f each ptin against the criteria was als agreed at the wrkshp. Criteria The fllwing criteria were agreed at the wrkshp: Criteria Safety Persnal Security Emergency Services Lifeline Rute Security Accessibility Cmmunity Severance Active Transprt Land Iwi Heritage Exemplified by Pedestrian, cyclist and mtrist safety. Safety f peple in public places by ensuring public places are well lit and able t be bserved by nearby residents and r passers by. In this cntext, 'public places' refer t the public rad reserves and adjacent places where members f the public are entitled t be. (as in "Crime Preventin Thrugh Envirnmental Design" (CPTED)) Ability f emergency services t respnd quickly t emergencies in all parts f the district, but with a particular emphasis n urban areas where events are mre cmmn. Influenced by distance f travel, number f intersectins t crss and traffic density The bridge carries utilities (water supply, electricity, telecmmunicatins) acrss the river. Ability t maintain essential utilities t cmmunities in the event f a civil defence emergency (fld, earthquake etc). Mst effectively achieved thrugh duplicatin. Ability t prvide reasnable access in the event f a lcal incident (breakdwn, accident etc), r majr emergency (natural hazard) clsing the existing bridge r apprach Ability t get t key destinatins within twn, including hmes, emplyment, educatin, medical, recreatin, and shpping. Includes walking, cycling, private mtr vehicle, public transprt, freight. Often a particular issue at peak times. The splitting f sectrs f a cmmunity by a physical & perceived barrier (includes rad & traffic). At twn level & street level. Prmting active transprt (e.g. walking and cycling as means f travel t schl and wrkplaces) by imprving and extending walking and cycling infrastructure, and imprving envirnmental cnditins fr walking and cycling (i.e. a safer, mre pleasant envirnment with gd quality surfaces); ften invlves increasing the separatin between vehicular traffic rutes (particularly thse invlving heavy vehicles) and pedestrian/cyclist rutes Ease f land acquisitin Number f prperties requiring partial r full acquisitin. Huses and ther buildings requiring demlitin. Dislcatin f prperty wners Impacts n lcal and reginal Iwi, Culturally imprtant sites, Accidental discvery f culturally imprtant artefacts Impact n heritage sites, buildings etc & archaelgy 66

73 Cmparative Optin Assessment Envirnment Water Amenity & Public Health Cst Ecnmic Develpment Planning fr the Lng Term Sewer Replacement Opprtunity Impact n water Quality, and river hydraulics Changes t amenity values, e.g. nise levels, air quality, vibratin, visual effects and streetscape. In severe cases has impacts n persnal health Ttal cst - Land & cnstructin. Whle f life cst. Lcal ratepayer share Impact n lcal businesses perating in Ashburtn and Tinwald. Cst t users, including freight peratrs (including flw n effects) Addressing shrt, medium, and lng term transprtatin issues thrughut the next 50 years Existing sewer siphn under Ashburtn River near the xidatin pnds is likely t need replacement in the medium t lng term. A new bridge may prvide a viable rute fr the sewer, and thereby reduce sme f the csts f sewer replacement. Assessment Each ptin was given a scre between -2 t +2 fr each criteria, where: -2 indicates the ptin has significant negative impact -1 indicates the ptin has mderate negative impact 0 indicates the ptin has little r n impact +1 indicates the ptin has mderate psitive impact +2 indicates the ptin has significant psitive impact. The preliminary assessment was then presented t the Cmmunity Reference Grup, and reviewed and refined in light f the Reference Grup cmments. A ttal f 24 scres were changed as a result f the Reference Grup inputs. The full assessment is included in Appendix F (bund separately). A summary f the assessment scres is shwn n the fllwing page. Ttal scres fr each ptin have been calculated as a raw ttal (i.e. a weighting f 1 fr each criteria), and as tw weighted ttals. Weighting Versin 1 was established fllwing an exercise with the Reference Grup t identify the mst imprtant factrs frm their perspective. These weightings reflect the imprtance placed n each f the criteria by the Reference Grup, with weightings frm 1 t 3, and with 0.5 increments. Weighting Versin 2 is a simplified versin f Versin 1. It nly uses tw weightings (1 r 2), cmpared t the five weightings in Versin 1. This results in less distinctin between the weightings applied t the assessment. 67

74 Cmparative Optin Assessment 68

75 Cmparative Optin Assessment Assessment Summary Using the Raw Ttal r either weighted versin results in similar rankings f the ptins, with the three Chalmers Avenue ptins scring significantly higher psitive scres than the ther ptins. This reflects the underlying fundamental premise f the assessment team that the bulk f the traffic n the existing bridge is lcal traffic; therefre ptins which take lcal traffic ff the State Highway will best address the issues n the existing bridge. It als reflects the fact that Chalmers Avenue is an existing high capacity rad which links well t east Ashburtn, and currently has significant excess capacity. The Tinwald Traffic Signals ptin scres furth behind the Chalmers Avenue ptins, with cmparatively mderate psitive scres. This is a shrt term ptin. It may address sme f the issues f turning right nt SH1 in the shrt term. Hwever, it will nt address the medium t lng term capacity issues f the existing bridge, and it may result in increased traffic between SH1 and nrth east Ashburtn using any future secnd bridge east f Tinwald. The scres fr the bypass ptins were clse t zer r slightly negative. These ptins d nt address the issue f prviding access between nrth and suth Ashburtn fr lcal traffic, and impse additinal travel distance fr State Highway inter district traffic. The uter bypass in particular is a high cst ptin due t the significant upgrades required f existing rads t bring them up t State Highway standards These may be viable ptins in the very lng term nce inter district thrugh traffic n SH1 has grwn t the pint f causing significant cngestin in central Ashburtn. The Melcmbe Street and State Highway fur laning ptins all had significant negative scres. All f these ptins cntinue t cncentrate all nrth-suth traffic in Ashburtn at ne lcatin. They d nt address the issue f prviding access between nrth and suth Ashburtn fr lcal traffic as effectively as the Chalmers Avenue ptins, and cme at a significantly higher cst. The ttal length f upgraded rute, and the csts assciated with prviding a railway crssing which meets current design standards cntribute t the high cst f these ptins. Current design standards require rads t crss railway lines at n mre than 20 deg frm perpendicular. In rder fr the State Highway t be free flwing, apprach curves wuld need t have a design speed equivalent t the perating speed f the rad r greater. This results in large reverse curves n bth sides f rail level crssings in urban areas. These curves are very large in rural areas where high apprach speeds are likely, such as at the suth end f Tinwald. 69

76 Public Cnsultatin 18 Public Cnsultatin The next phase f this prject is public cnsultatin n the utcmes f these additinal investigatins. As nted abve, a ttal f nine ptins (including Tinwald traffic signals) have been cnsidered in this phase f the prject. Mst f these ptins have significant impacts n private prperty wners, and n the cmmunity. Public cnsultatin n the basis that any ne f these ptins is likely t be the final chice is likely t cause significant cncern amngst affected prperty wners and cmmunities. In rder t minimise unnecessary cncern and stress amngst affected prperty wners and cmmunities it is recmmended that fr the purpses f cnsultatin the ptins are ranked in tw categries, namely Likely, and Unlikely Likely The Likely categry will include thse ptins which are cnsidered t mst effectively meet the assessment criteria. It is likely that ne f these ptins will be the ptin which prceeds t land designatin. It is recmmended that the likely categry cnsist f the fllwing ptins: Chalmers Avenue t East f Tinwald (rural) Chalmers Avenue t East f Tinwald (urban) Chalmers Avenue t Grve Street Unlikely The unlikely categry will include thse ptins which are cnsidered t nt effectively meet the assessment criteria at this stage. It is unlikely that any f these ptins will prceed t land designatin. It is recmmended that the unlikely categry include the fllwing ptins: Outer Bypass Inner Bypass Melcmbe Street (Railway level crssing) Melcmbe Street (Railway verpass) State Highway 1 Fur Laning. It is further recmmended that further investigatins int the ptin f installing traffic signals in Tinwald prgress in parallel with a secnd bridge ptin. These investigatins wuld cnsider the fllwing: The viability f signals as an interim measure; The pssible lng term impacts f signals n the preferred secnd bridge ptin; and The ptimum lcatin fr signals in Tinwald. 70

77 Recmmendatins 19 Recmmendatins The fllwing recmmendatins are made as a result f these investigatins: 1. That public cnsultatin n the results f these additinal investigatins, and n the ptins cnsidered be carried ut 2. That the ptins be categrised as fllws fr that public cnsultatin: a. Likely: Chalmers Avenue t East f Tinwald (rural) Chalmers Avenue t East f Tinwald (urban) Chalmers Avenue t Grve Street b. Unlikely: Outer Bypass Inner Bypass Melcmbe Street (Railway level crssing) Melcmbe Street (Railway verpass) SH1 Fur Laning 3. That further investigatins int the suitability and lcatin f traffic signals in Tinwald prceed in parallel with a secnd bridge prject. 71

78 APPENDIX A - Ashburtn Street Map - Ggle Map f the Ashburtn River

79

80