MEMORANDUM. Mayor and Boise City Council. Hal Simmons - Planning Director Boise City Planning and Development Services

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1 MEMORANDUM TO: FROM: PREPARED BY: Mayor and Boise City Council Hal Simmons - Planning Director Boise City Planning and Development Services Leon Letson Associate Planner Boise City Planning and Development Services MEETING DATE: September 13, 2016 RE: Highlands Cove Traffic Distribution CFH / PUD / SUB Highlands Cove, LLC is requesting approval of a Traffic Study and Mitigation Plan associated with a 57-unit planned residential development located at 1200 E. Highland View Drive. The following record is provided for your review: Page 2 Summary of City Council Action Page 2 Summary of Traffic Study and Mitigation Plan Page 3 Planning Team Recommendation Page 5 Traffic Study and Mitigation Plan Materials Page 20 Highlands Area Recommended Traffic & Safety Improvements Report ACHD Memo dated July 22, 2016 Page 22 Highlands Cove Subdivision Review ACHD Memo dated August 6, 2015 Page 56 Highlands Neighborhood Association Comments

2 CFH , PUD & SUB City Council September 13, 2016 Page 2 Summary of City Council Action On December 15 th, 2015, City Council approved a 57-unit planned residential development at 1200 E. Highland View Drive referred to as Highlands Cove. Per this approval, the developer was required to submit a Traffic Study and Mitigation Plan in accordance with the following condition of approval: 3.a Prior to approval of the Final Plat, the applicant shall submit a Traffic Study and Mitigation Plan to the City for review and approval. The Mitigation Plan shall outline a minimum of $120,000 in improvements within the surrounding neighborhood that shall be designed, as modeled by the Traffic Study, to direct no more than 50% of the anticipated traffic from this development to Highland View Drive. Summary of Traffic Study and Mitigation Plan The Highlands Cove Traffic Study and Mitigation Plan submitted by the applicant asserts that 60%- 70% of the traffic generated from Highlands Cove will make use of E. Braemere Road as the primary route in and out of the development, even without additional traffic calming or traffic diversion measures. This conclusion is based on assumed destinations and that drivers choose to take the route with the shortest travel time. Travel times are calculated using distance of travel and speed of travel, which is based on posted speed limits. The fact that average speeds are slightly higher than posted speed limits on E. Braemere Road and Highland View Drive is acknowledged. However, because the difference between the posted speed and observed vehicle speed is essentially equal between roadways, it is assumed that travel times are affected proportionally. Destination intersections included in the study are Bogus Basin Road-Hill Road and 15 th Street-Hill Road. Although the majority of traffic will travel to Downtown Boise from these intersections, the developer anticipates that at least 25% will travel west along Hill Road, based on 2012 traffic counts. The current layout of the development has 24 of the 57 homes (42%) located along Chardie Road and Highland View Drive, north of the Chardie Road-Highland View Drive intersection. It is expected that these homes will make use of E. Braemere Road as their primary route in and out of the development due to a shorter distance than travelling on Highland View Drive (1.36 miles on Braemer vs miles on Highland View Drive) and travel time to the destination intersections (5.60 minutes on Braemer vs minutes on Highland View Drive). Of the remaining 33 homes, approximately 8, or 25%, are expected to also make use of the E. Braemere Road route to reach destinations to the west of the Bogus Basin-Hill Road intersection, based on the previously noted traffic split for the Bogus Basin Road-Hill Road intersection. These homes, in addition to the 24 along Chardie Road and Highland View Drive, north of the Chardie Road-Highland View Drive intersection represent 56% of the total development. Regarding the remaining 25 homes, an unspecified majority are expected to also make use of E. Braemere Road, which supports the 60%- 70% traffic distribution noted earlier. To ensure that no more than 50% of traffic from the development makes use of Highland View Drive, the use of chicanes or center islands within the new extension of Highland View Drive are recommended by the developer, as are speed bumps along existing Highland View Drive. The Traffic Study and Mitigation Plan was transmitted to the Highlands Neighborhood Association (HNA) and comments were received. After noting concerns about various aspects of the Traffic Study, the following conditions were requested:

3 CFH , PUD & SUB City Council September 13, 2016 Page 3 1. Require the installation of the one-way traffic diverter at the Highland View Drive-E. Braemere Road intersection in the initial phase of the development. 2. Require the construction of the Chardie Road extension in the initial phase of the development. 3. Require a chicane near the new extension of Highland View Drive in the southern portion of the development. 4. Provide an assured commitment to continued monitoring and mitigation during the build-out of the development. 5. Install future active mitigation projects, as needed. Planning Team Recommendation In addition to the materials submitted by the applicant, the Planning Team based the following recommendation on the recent effort undertaken by ACHD to address pedestrian, bicycle, and vehicle safety in the greater Highlands Neighborhood. In an attached memo from ACHD dated July 22, 2016, several mitigation projects are outlined by roadway, the bulk of which consist of upgrading key intersections with stop signs and crosswalks. Also included are improvements to lighting, signage, and pedestrian facilities (i.e. filling sidewalk gaps; creating on-street walkways with striping, extruded curb, or candles, etc.), as well as a one-way traffic diverter at the Curling Drive-E. Braemere Road intersection to allow right turns only from eastbound Curling Drive to southbound W. Braemere Road. Another one-way traffic diverter will also be installed at the Highland View Drive-E. Braemere Road intersection to prevent traffic to the north of this intersection from making use of Highland View Drive as a route in and out of the neighborhood. This was required with ACHD s original approval of the Highlands Cove development and is not included in the most recent list of mitigation projects. Several of these improvements have been completed, including the installation of stop signs and the one-way traffic diverter at the Curling Drive-E. Braemere Road intersection. Regarding the impact of these ACHD projects on the developer s Traffic Study and Mitigation Plan, they further support the assertion that Braemere Road will be the preferred route in and out of the development. In particular, additional stop signs, crosswalks, and a walking path on Highland View Drive will serve as traffic calming measures to slow vehicles travelling on this route. The chicanes or center islands proposed as part of the new Highland View Drive extension should also assist in discouraging the use of Highland View Drive by vehicles. However, the speed bumps proposed by the developer have been identified by ACHD and the neighborhood as something not to be pursued. The Planning Team recommends approval of the Traffic Study and Mitigation Plan with the following conditions: 1. Of the $120,000 to be provided by the developer for traffic calming, the City shall receive and administer $100,000; the remaining $20,000 shall be received and administered by ACHD, per their approval memo dated August 6, The $120,000 in funding from the developer may be used toward chicanes or center islands within the development; remaining funds shall be used on traffic calming projects outside of those identified in the July 22, 2016 ACHD memo Highlands Area Recommended Traffic & Safety Improvements Report. 3. The proposed traffic diverter at the Highland View Drive-E. Braemere Road must provide bicycle and pedestrian access through the diverter via gaps in the raised concrete or the use of candlesticks, versus raised concrete, for the diverter; this project is to be funded outside of

4 CFH , PUD & SUB City Council September 13, 2016 Page 4 the $120,000 dedicated to traffic calming. 4. The proposed traffic diverter at the Curling Drive-E. Braemere Road intersection should be installed and tested as a two-phase pilot project to establish the optimal traffic volume diversion. The amount of traffic diverted from W. Braemere needs to be balanced with the overall mobility and connectivity of the Highlands neighborhood.

5 July 26, 2016 Leon Letson Boise City Planning & Development Services PO Box 500 Boise, ID RE: Highlands Cove Subdivision/PUD , CFH , & SUB /1200 E. Highland View Dr Dear Mr. Letson: In compliance with site specific condition 3a for the Highlands Cove Subdivision, please see the attached traffic distribution report prepared by Dan Thompson for the City s review and approval. Also attached is a supplemental memo to ACHD regarding the Braemere island. The report works with the Traffic Study for the area and then further analyzes the expected traffic distribution from this development utilizing the preliminary plat as approved without the 3 lots on Highland View Drive. As you will see, the report concludes that less than 50% of the anticipated traffic from this development will use Highland View Drive. As a result, no off-site mitigation measures were recommended to satisfy the condition since the condition will be met. At the conclusion of the report, alternative ways to further discourage traffic on Highland View Drive are considered. If any are implemented, they will help ensure no more than 50% of the traffic from this development will use Highland View Drive. Based upon the site topography and input from the traffic engineer, Dan Thompson, and our civil engineer, Dave Sterling, the traffic measure that we will recommend installing within our development are traffic separating islands in Highland View Drive. The islands will be in the southern section of the development in the area where there will not be homes so that off-street parking is not negatively impacted for the future homes. Installing these islands will encourage slower traffic in this area, which in turn should help ensure less than 50 percent of the traffic from our development will use Highland View Drive. Even though this report concludes that no additional traffic measures are needed to comply with the condition, we agree to pay the balance of the $120,000 required in this condition, after the cost of these islands, to ACHD to assist in their efforts to address existing traffic problems and improve traffic safety for The Highlands neighborhood. Once again, any traffic calming measures installed in Highland View Drive as a result of this condition, would again help ensure even less traffic will choose Highland View Drive as their primary route to and from the site. After City approval of the attached report and prior to final plat approval, we will prepare to disburse funds to ACHD.

6 Please note that we would have provided this information to the City sooner, however there was additional discussion with ACHD regarding the configuration and timing of the island in upper Braemere per the ACHD condition of approval. Since Highlands Cove will be installed in 2 phases, we consulted the traffic engineer on the impact of the timing to install the island in Braemere. The traffic engineer recommends this work be done after the connection to Chardie takes place to avoid an interim adverse affect on the traffic flows onto Highland View Drive (see the attached referenced memo from Dan Thompson). This information has been provided to Bruce Mills at ACHD and based on follow up conversations with ACHD staff we believe ACHD concurs with this finding and plan of action. We will also send a copy of all this information to Highlands Neighborhood Association. Please feel free to contact me if you have any questions. Sincerely, David Yorgason David Yorgason Highlands Cove, LLC 3517 S Ashbury Way Boise, ID Attachments: Traffic Distribution report completed by Thompson Engineers, Inc. dated Dan Thompson memo to ACHD re: Highlands Cove dated

7 February 25, East 50 th St. Garden City, ID (208) (Cell) Dave Yorgason Highlands Cove LLC W Battenberg Dr. Boise, ID RE: Highlands Cove Subdivision Dear Mr. Yorgason, As requested, we have reviewed the above referenced project to address distribution of traffic generated by the development. Our task is to determine how the site traffic will distribute, and if necessary, determine ways to discourage traffic from using Highland View Drive to travel to their destinations. We are assigning traffic distribution based on assumed destinations and the shortest travel time. This is in conformance with the practices recommended by the Institute of Transportation Engineers in their Recommended Practice for Preparation of Traffic Impact Studies. The travel time will be affected by the distance of travel and the speed of travel. The speed limit on Highland View Drive is 20 MPH north of Parkhill Drive and 25 MPH south of Parkhill Drive. The speed limit on East Braemere is 25 MPH with a short stretch at 20 MPH. Bogus Basin has a posted speed of 30 MPH. For comparison purposes, the posted speed limit is used to determine travel times. Traffic from this site will travel to destinations throughout Ada County. It is likely that the primary destination for a majority of the site traffic will be downtown Boise, but other destinations are also likely. Using 2012 counts at the intersection of Bogus Basin/Harrison Blvd and Hill Road, approximately 28% of that traffic travels to and from destinations west on Hill Road. We assume that at least 25% of traffic generated by this development will also travel to the west. The other 75% will travel south on either Harrison Blvd or 15 th St, or east on Hill Road. As noted above, vehicles from the site will choose the shortest route based on travel time. Please find attached Exhibit 1 which shows the distances from the intersection of West Braemere and Highland View Drive to the end of Highland View Drive is 1.05 miles. The same exhibit shows the distance from the same intersection to the end of Chardie Road via West and East Braemere is 1.10 mile. Chardie Road will be extended 0.26 miles. Highland View Drive will be extended 0.46 miles to intersect with Chardie. This means the maximum travel distance for all homes located on Chardie will be 1.36 miles via East Braemere, compared to 1.51 miles via Highland View Drive. The East Braemere Drive route also has a higher average speed limit than the Highland View Drive Route. For these reasons, we do not believe any of the 21 homes on Chardie, or the three homes located north of Chardie on Highland View Drive, will use Highland View Drive as a route to their destinations. This is 24 of the 57 total homes. The remaining 33 homes will choose between Highland View Drive and East Braemere Drive to travel to their destinations. As noted above, we believe that 25% will want to travel to the west. Please find attached Exhibit 2 that indicates a distance of 2.08 miles from the end of Chardie Drive to the intersection of Bogus Basin Road and Hill Road. There will also be 0.40 miles of on site roadway. Using the posted speed limit for the various segments, we estimate the travel time for this route to be 5.83 minutes. The same map indicates a distance of 1.89 miles from the current end of Highland View Drive to the intersection of Bogus Basin Road and Hill Road. There will be 0.33 miles of on site roadway. Again Page 1

8 using the posted speed limit for each segment, we estimate the travel time for this route will be 6.27 minutes. Based in travel time, we believe most of the site traffic that wants to travel west will choose the E. Braemere Drive route instead of the Highland View Drive route. Both routes will encounter 2 stop signs on the route. Again, we believe that 25% of the remaining 33 homes will want to travel to the west, and that East Braemere is the fastest route. That means that traffic from at least 8 homes will use East Braemere. Together with the 21 homes on Chardie and the 3 on Highland View Drive north of Chardie, a total of 32 (56%) homes will use East Braemere Drive as the primary route in and out of the subdivision. The remaining 25 (44%) will still need to choose between East Braemere and Highland View Drive. If we choose the intersection of Highland View Court and Broadstone Court as the center of the development, we can estimate travel times to the intersection of W. Braemere and Highland View Drive. The distances on existing streets are discussed above. They are 1.10 miles using the Chardie/East Braemere route, and 1.05 miles using Highland View Drive. Based on measurements from the preliminary plat, vehicles will have to travel approximately 0.40 miles from Broadstone Court to the current end of Chardie. The other option will require them to travel 0.32 miles to the current end of Highland View Drive. These distances are shown on Exhibit 3. Using posted speed limits, we estimate that it will require 3.91 minutes to travel the East Braemere route, compared to 4.11 minutes using the Highland View Drive route. Given the shorter travel time, we would expect the majority, but not all, of traffic from the remaining 25 homes to use East Braemere. Some of the site traffic will decide that travel down Bogus Basin Road is a preferred route to destinations to the south and east. Based on the above analysis, we estimate that 60-70% of the site traffic will choose to use East Braemere Drive as the primary route in and out of the subdivision, and 30-40% will choose Highland View Drive. This is in relatively close agreement with our original report that was approved by the Ada County Highway District. The difference is the result of more detailed analysis and a more developed preliminary plat. As noted above, a major element of our analysis is that vehicles will travel at the posted speed limit. In reality, we know that average speeds are above the posted speeds, but they are above average on both Highland View Drive and East Braemere by approximately equal percentages, so the travel times are affected proportionally. Part of our study is to recommend traffic calming measures that will help ensure that no more than 50% of the site traffic uses Highland View Drive as the primary route in and out of the subdivision. In this case, traffic calming measures are only necessary to maintain the existing shortest route. Traffic calming is more effective at controlling speed than reducing congestion, but by controlling speeds on Highland View Drive, we can be assured that the shortest routes discussed above will be maintained, and most of the traffic will use East Braemere Drive. Please find attached a table entitled Neighborhood Traffic Calming. This is from the City of Rochester, New York, Neighborhood Traffic Calming Manual. This table lists several types of traffic calming and recommends the applicability to certain traffic issues. If our goal is to reduce the volume of traffic, barriers and diverters would be the most effective and applicable. However, these measures involve forcing traffic to other routes, and thus limit mobility. Since extending Highland View Drive to East Braemere is an objective of the project, restricting traffic from using this segment of roadway with barriers or diverters is counterproductive. Installing barriers or diverters at other locations on Highland View Drive will divert traffic to other local roads, which is probably unacceptable to neighborhoods. Page 2

9 Chokers, chicanes and bump outs are effective in reducing speed. Of these, chicanes would be the most effective at reducing speeds and congestion. A chicane is a restriction in the road width, accompanied by some curvature that requires vehicles to slow down. Attached is a description of a chicane from the Rochester Neighborhood Traffic Calming Manual. Installing these on existing Highland View Drive would involve eliminating on street parking from in front several residences. However, the proposed extension of Highland View Drive north of the current terminus offers an opportunity to include a chicane into the design of the roadway. A center island with associated narrowing along the proposed extension would also provide calming of speeding vehicles. This could be incorporated into the design in conjunction with or instead of a chicane. This treatment would not impact existing or future housing. On existing Highland View Drive, horizontal control measures may provide calming of speeding, but would likely impact on street parking and drainage facilities. Vertical measures, such as speed humps, will provide effective means of controlling speeds. The Institute of Transportation Engineers Handbook on Traffic Calming estimates that speed humps result in a reduction in speed of up to 17%. The Handbook recommends 12 foot long humps, no more than 3.5 inches high. They should be spaced from 200 to 250 feet apart to maintain a 20 MPH travel speed. In summary, it is our opinion that less than 40% of the traffic from this development will use Highland View Drive as the main route to and from the development because it is not the shortest route to their destinations. Designing chicanes or a center island into the proposed extension of Highland View Drive will help ensure the speed on this segment of roadway is controlled. Installing speed humps on existing Highland View Drive will help ensure speed on this segment of roadway is controlled. By controlling the speed, we ensure that Highland View Drive will remain the longer route and further discourage site traffic from using this route. Should you have any question, please call. Sincerely, Thompson Engineers, Inc. Daniel A. Thompson, P.E. 2/25/16 Page 3

10 July 7, East 50 th St. Garden City, ID (208) (Cell) Bruce Mills, PE Ada County Highway District 3775 Adams St Garden City, ID RE: Highlands Cove Subdivision Dear Mr. Mills, Dave Yorgason has asked us to review your of June 9, 2016, including comments from Terry Little, concerning the intersection of Highlands View Drive and Braemere Road. Specifically, the discusses the proposed improvements to the islands on Braemere that restrict movements to and from Highland View Drive. First of all, the project will be built in two phases. The extension of Chardie Road to Highland View Road will not occur until the second phase. Installing turn restrictions at Braemere and Highland View before the construction of Chardie will force all traffic to use Highland View Drive south of the project site. This is exactly what we are trying to prevent. We ask that the modifications to the intersection be delayed until phase 2 of the project. Next, we have estimated travel times from the site using measured distances and posted speed limits. Based on this analysis, we believe that 60-70% of the site traffic will prefer to use Braemere instead of Highland View Drive to access the transportation system. We believe that only the houses closest to the southeast end of the subdivision will use Highland View Drive. We are further trying to encourage the use of Braemere with traffic calming within our subdivision, and on Highland View Drive south of our site. The developer has pledged $120,000 for this effort. Based on this, we do not believe that traffic from the Nines or elsewhere along Braemere would be inclined to use Highland View Drive. We recommend that we delay any construction of improvements to the intersection of Braemere and Highland View Drive as recommended above, and take this time to study the intersection and see if there are any grounds for the modification of the intersection. Finally, we have concerns with restricting left turns from Highland View on to Braemere. We feel that restricting this movement will encourage traffic to use Highland View Drive instead of Braemere for egress. Again, this is counter to what we are trying to achieve. We wish to emphasize that the developer is not requesting to remove the condition that requires the construction of the diverter. However, we want to be sure the configuration of the island and timing of construction meet the goals and purpose of the conditions, which is to limit traffic on Highlands View Drive. Should you have any question, please call. Sincerely, Thompson Engineers, Inc. Daniel A. Thompson, P.E. 7/7/16

11 Broadstone to Hill via Bogus Basin and E Braemere 0 mi Copyright and (P) Microsoft Corporation and/or its suppliers. All rights reserved. Certain mapping and direction data 2012 NAVTEQ. All rights reserved. The Data for areas of Canada includes information taken with permission from Canadian authorities, including: Her Majesty the Queen in Right of Canada, Queen's Printer for Ontario. NAVTEQ and NAVTEQ ON BOARD are trademarks of NAVTEQ Tele Atlas North America, Inc. All rights reserved. Tele Atlas and Tele Atlas North America are trademarks of Tele Atlas, Inc by Applied Geographic Solutions. All rights reserved. Portions Copyright 2012 by Woodall Publications Corp. All rights reserved.

12 Broadstone to 15th and Hill via Highlands View 0 mi Copyright and (P) Microsoft Corporation and/or its suppliers. All rights reserved. Certain mapping and direction data 2012 NAVTEQ. All rights reserved. The Data for areas of Canada includes information taken with permission from Canadian authorities, including: Her Majesty the Queen in Right of Canada, Queen's Printer for Ontario. NAVTEQ and NAVTEQ ON BOARD are trademarks of NAVTEQ Tele Atlas North America, Inc. All rights reserved. Tele Atlas and Tele Atlas North America are trademarks of Tele Atlas, Inc by Applied Geographic Solutions. All rights reserved. Portions Copyright 2012 by Woodall Publications Corp. All rights reserved.

13 Chardie Highlands to 15th and Hill via Highlands View 0 mi Copyright and (P) Microsoft Corporation and/or its suppliers. All rights reserved. Certain mapping and direction data 2012 NAVTEQ. All rights reserved. The Data for areas of Canada includes information taken with permission from Canadian authorities, including: Her Majesty the Queen in Right of Canada, Queen's Printer for Ontario. NAVTEQ and NAVTEQ ON BOARD are trademarks of NAVTEQ Tele Atlas North America, Inc. All rights reserved. Tele Atlas and Tele Atlas North America are trademarks of Tele Atlas, Inc by Applied Geographic Solutions. All rights reserved. Portions Copyright 2012 by Woodall Publications Corp. All rights reserved.

14 Chardie Highlands to Bogus Basin via E Braemere 0 mi Copyright and (P) Microsoft Corporation and/or its suppliers. All rights reserved. Certain mapping and direction data 2012 NAVTEQ. All rights reserved. The Data for areas of Canada includes information taken with permission from Canadian authorities, including: Her Majesty the Queen in Right of Canada, Queen's Printer for Ontario. NAVTEQ and NAVTEQ ON BOARD are trademarks of NAVTEQ Tele Atlas North America, Inc. All rights reserved. Tele Atlas and Tele Atlas North America are trademarks of Tele Atlas, Inc by Applied Geographic Solutions. All rights reserved. Portions Copyright 2012 by Woodall Publications Corp. All rights reserved.

15 Neighborhood Traffic Calming Chicane Chicanes are curb extensions that alternate from one side of the street to the other, forming S shaped curves that are used to slow traffic speeds. They are also commonly referred to as deviations, serpentines, reversing curves or twists. Advantages: Chicanes provide the opportunity for landscaping and streetscape beautification. The curves of a chicane force drivers to slow down in speed. Emergency response tends to prefer chicanes rather than speed humps, as they are easier for larger vehicles to negotiate. Disadvantages: Criteria for Use: Chicanes are good for locations where speeding is a problem but noise associated with speed humps, textured pavements, and related measures would be unacceptable. Chicanes can negatively affect parking and driveway access. Street sweeping may need to be done manually. Chicanes with landscaping require maintenance to be done by neighborhood residents. Effectiveness: There is currently no data available to determine the effectiveness of chicanes and their ability to calm traffic. 12

16 Neighborhood Traffic Calming Types of Measures Horizontal Measures Traffic Issue Speeding Accidents Congestion Noise Pedestrian Safety Type of Street N C A Pg. 9 Roundabouts Pg. 10 Traffic Circles Pg. 11 Chokers Pg. 12 Chicanes Pg. 13 Bump Outs Pg. 14 Pg. 15 Re-aligned Intersections Center Island Narrowing Pg. 16 Median Barriers Pg. 17 Diagonal Diverters Pg. 18 Star Diverters Pg. 19 Forced Turned Island Pg. 20 Half Closures Pg. 21 Semi-Diverters Pg. 22 Full Closures Vertical Measures Pg. 23 Speed Humps Pg. 24 Speed Tables Pg. 25 Raised Intersections Pg. 26 Raised Crosswalks Pg. 27 Textured Pavement Non-Physical Measures Pg. 28 Speed Enforcement Pg. 29 Lane Striping Pg. 30 Radar Trailer Key Neighborhood Streets (N) = < 3,000 cars/day Collector Streets (C) = 3,000-10,000 cars/day Arterial Streets (A) = > 10,000 cars/day 8

17 Exhibit 1 - Travel Distances from Highland View and West Braemere 0 yds Copyright and (P) Microsoft Corporation and/or its suppliers. All rights reserved. Certain mapping and direction data 2012 NAVTEQ. All rights reserved. The Data for areas of Canada includes information taken with permission from Canadian authorities, including: Her Majesty the Queen in Right of Canada, Queen's Printer for Ontario. NAVTEQ and NAVTEQ ON BOARD are trademarks of NAVTEQ Tele Atlas North America, Inc. All rights reserved. Tele Atlas and Tele Atlas North America are trademarks of Tele Atlas, Inc by Applied Geographic Solutions. All rights reserved. Portions Copyright 2012 by Woodall Publications Corp. All rights reserved.

18 Exhibit 2 Travel Distances to Bogus and Hill 0 mi Copyright and (P) Microsoft Corporation and/or its suppliers. All rights reserved. Certain mapping and direction data 2012 NAVTEQ. All rights reserved. The Data for areas of Canada includes information taken with permission from Canadian authorities, including: Her Majesty the Queen in Right of Canada, Queen's Printer for Ontario. NAVTEQ and NAVTEQ ON BOARD are trademarks of NAVTEQ Tele Atlas North America, Inc. All rights reserved. Tele Atlas and Tele Atlas North America are trademarks of Tele Atlas, Inc by Applied Geographic Solutions. All rights reserved. Portions Copyright 2012 by Woodall Publications Corp. All rights reserved.

19 Exhibit 3 Travel Distances from Broadstone 0 mi Copyright and (P) Microsoft Corporation and/or its suppliers. All rights reserved. Certain mapping and direction data 2012 NAVTEQ. All rights reserved. The Data for areas of Canada includes information taken with permission from Canadian authorities, including: Her Majesty the Queen in Right of Canada, Queen's Printer for Ontario. NAVTEQ and NAVTEQ ON BOARD are trademarks of NAVTEQ Tele Atlas North America, Inc. All rights reserved. Tele Atlas and Tele Atlas North America are trademarks of Tele Atlas, Inc by Applied Geographic Solutions. All rights reserved. Portions Copyright 2012 by Woodall Publications Corp. All rights reserved.

20 Kent Goldthorpe, President Paul Woods, Vice President Rebecca W. Arnold, Commissioner Sara M. Baker, Commissioner Jim D. Hansen, Commissioner MEMORANDUM Engineering Division July 22, 2016 To: From: Subject: ACHD Commissioners and Director Bruce Mills, PE, Deputy Director, Engineering Division Highlands Area Recommended Traffic & Safety Improvements Report Executive Summary Following the summer 2015 Highland Cove Subdivision hearings, ACHD staff was directed to work with the Highlands neighborhood through a public process to assess and recommend various mitigation measures to improve the safety for all modes of travel in the greater Highlands area. This report summarizes this effort and makes recommendations for implementation of improvements. Chronology Date June 24, 2015 August 5, 2015 December 1, 2015 February 10, 2016 April 6, 2016 June 15, 2016 April-July 2016 Event Highlands Cove Subdivision hearing; deferred a decision to examine mitigation to address traffic and safety concerns Commission approved application; mitigation to await Boise Council action Boise City Council approved preliminary plat application Work session on mitigation to take to public open house meeting Held public open house meeting, gathered input directly and through a survey Commission approved interim stop signs at five locations prior to construction Staff worked with neighborhood representatives to refine mitigation measures Proposed Mitigation by Corridor Highland View Drive Description Estimated Cost Schedule Stop signs at Selkirk and Whidden (during construction $500 Installed July 2016 as pilot first) Extruded curb protected walking path, northerly side, Braemere to 900 east of Selkirk (existing sidewalk). Eliminates parking on northerly side. $50,000 (3700 ) By Spring 2017; potential partial pilot in 2016? Crosswalks at several locations (demand verified) $2,500 By Spring 2017 Assess pedestrian/bike treatments - Parkhill to Braemere TBD By Spring 2017 Eliminated from consideration: o Speed humps (unsupported) o Street lighting (unsupported light pollution) o Bus stops (can use protected path area) Ada County Highway District 3775 Adams Street Garden City, ID PH FX

21 Upper Braemere (northeasterly of Curling) Description Estimated Cost Schedule Stop signs at Balmoral and Chardie/Harcourt (during $500 Installed July 2016 construction as pilot first) Radar speed sign (alternate locations annually with $5,000 Fall 2016 Highland View Drive) Crosswalks at several locations (demand verified) $2,500 By Spring 2017 Eliminated from consideration: o Speed humps (unsupported) o Medians (try stop signs first) o Chicanes (hard to retrofit/lost parking) Lower Braemere (Highland View Drive to Curling) Description Estimated Cost Schedule One-way diverter, Curling to Ranch as a pilot. Includes $2,000 Fall 2016 as pilot buffered walking path on surplus pavement. Eliminates all travel from Upper Braemere and Curling onto Lower Braemere, except for right turns from Curling Sidewalk on northwesterly side of Ranch, as a community program project $20,000 TBD Eliminated from consideration: o Additional speed humps (unsupported) Bogus Basin Description Estimated Cost Schedule Install sidewalk gap connections northerly of Curling TBD TBD (community program project) Enhanced lighting at SW corner of Bogus/Curling $2,000 Fall 2016 In-pavement pedestrian sign paddle across Bogus at $300 August 2016 Curling crosswalk Advance Warning Signage approaching Ranch $250 August 2016 Curling Description Estimated Cost Schedule Install all-way stop signs at Braemere, with ped ramp and new crosswalk $2,000 Stop sign in; other work in August 2016 Install interim candle-protected walking path along $15,000 Fall 2016 southerly side of Curling from Braemere to Cashmere. Involves widening north side of road and moving hydrant. Potential future community sidewalk project. Stripe 6 walking path along southerly side, Cashmere to $2,000 Spring 2017 Selkirk (no parking restriction) vet with residents. Assess protected crosswalk treatment in front of school, in conjunction with School District assessment of improved parking lot/drop off/pick up rehabilitation project first. TBD TBD Cashmere/Whidden Description Estimated Cost Schedule Stripe 6 walking path on north side of Cashmere (Whidden to Curling) and crosswalk across west leg of Cashmere/Whidden. Stripe 6 walking path on west side of Whidden (Cashmere to HVD). No parking restrictions vet with residents. All to improve safe route to school. $1,000 Spring 2017 Recommendation Implement items as outlined in report. Monitor and report back impacts to Commission.

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56 Highlands Cove Traffic Conditions of Approval: Neighborhood Input Highlands Traffic Mitigation Team September 7, 2016

57 50/50 Split Condition Summary Developer study is not comprehensive and flawed First study key conclusions obsolete based on W. Braemere diverter now implemented The subsequent data only emphasizes time deltas based on speed limits The distances are shorter utilizing Highland View Human nature indicates, people gravitate to the shorter distance If speed limits were the only factor, there would be no cut-through on West Braemere which we know not to be the case Developer study fails to account for non-home owner traffic that will utilize Highland view based on map software directing based on shorter distance and Highland View addresses (service vehicles) Fails to account for cut-through from upper Braemere/Nines area on the evening side returning home Traffic study from developer does not meet common sense standard Study concludes <40% will travel out HVD, yet 58% of households are located near HVD 10 seconds time savings would not compel HVD houses to drive uphill to go downhill via E. Braemere if transit time is similar, drivers take most direct, shortest distance route to downtown (HVD is shorter and more direct for most homes) Bogus Basin route also is more variable, subject to rush hour and ski traffic, and requires driving in front of school Important qualitative factors Independent analysis indicates 60% plus of traffic will utilize Highland View both in-bound and out-bound Intuitive rationale based on human behavior Position of houses to Highland View Drive Turning downhill rather than uphill Avoiding the diversion and taking Highland View as a result Shorter distance Critical to existing neighborhood that active mitigation be required to ensure traffic disperses properly Developer suggestions provide no active mitigation Highland View infrastructure cannot handle the majority of traffic

58 Assumptions Comparison Agreement on some assumptions: 75% of trips are heading South or East. 25% heading West. Driving distances and times as stated (as amended 9/2). Disagreement on some assumptions: When one route is <1 minute different from another, route decision is based primarily on perception of direction of destination (most direct route), the tendency to drive downhill (and not unnecessarily uphill), and distance Braemere diverter makes time comparison to HVD/W. Braemere obsolete Relevent comparison is to 15 th and Hill for East and Southbound trips, to BB and Hill for Westbound trips More reasonable assumptions for dispersion: Chardie side homes (42%) Will take E. Braemere most trips Houses toward center will take Highland View for many trips downtown Highland View side homes (58%) Will take Highland View for most trips Result: Without mitigation ~60%+ of traffic would use HVD Further increased by uphill traffic to Nines area

59 60%+ of Trips Will Exit down HVD Assumptions: East and South Bound trips from Chardie side will be of similar time (~50 seconds longer to 15th and Hill) but perceived as more direct if using HVD. (.18 mi. closer and in the right direction). Therefore ~1/3 of trips will go that way All East and Southbound trips from HVD side will be equal or slightly faster on HVD vs Braemere and will be perceived as more direct and shorter (.46 mi and in the right direction) Westbound trips from HVD side will be of similar time (~40 seconds longer to BB and Hill) but perceived as more direct if using HVD (.24 mi.closer and in the right direction). Therefore ~1/3 of trips will go that way Won t drive uphill to go downhill House Location Destination Location West Bound East + South Bound Total Total % Total Br Route HV Route Total Br Route HV Route Total Br Route HV Route Br HV Chardie Side % 25% HV Side % 85% Total % 60%

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61 ACHD Approved Traffic Plan Does Not Supercede Mitigation Required of Developer Does not assure <50% exits on Highland View Drive Helps mitigate pre-existing infrastructure deficit but does not improve adequately for additional traffic Streets still substandard with new ACHD changes. Grades, curves, street widths, pedestrian and bike facilities still sub-par Key projects in ACHD plan are not assured without funding

62 Highlands Minimum Request of City Council Require the already approved E. Braemere/HVD diverter in the initial phase Ensures diverter is in place before drivers establish patterns driving down HVD Require Chardie connection in the initial phase of the subdivision Ensures alternate route is available before drivers establish patterns Require chicane near subdivision exit on Highland View side Funded by developer (not part of $120K) Provide assured commitment to continued monitoring and mitigation during buildout Traffic counts to ensure 50% split and monitor cut-through $120K held for additional future mitigation Establish owner on City Staff as contact with neighborhood and ACHD Future active mitigation to possibly include Diverter at Chardie/HVD to discourage uphill through-traffic to Upper East Braemere area Additional chicanes, islands, or humps Gate

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64 Braemere distance = 2.48 miles Highland View Drive = 2.23 Miles Distances to most destinations are shorter on HVD

65 Appendix

66 Key Distances and Drive Times Based on Thompson Study Westbound Trips To BB and Hill From Chardie/HV Broadstone/HV via Braemere 5.6 min/2.4 mi 5.99 min/2.54 mi via HV 7.08 min/2.42 mi 6.66 min/2.28 mi Difference min min Thompson data Thompson data with.33 min. and.1 mi added to get from BB to 15 th via Park Hill East and Southbound Trips To 15th and Hill From Chardie/HV Broadstone/HV via Braemere 5.93 min/2.5 mi 6.32 min/2.64 mi via HV 6.75 min/2.32 mi 6.33 min/2.18 mi Difference Thompson data with.33 min. and.1 mi added to get from 15 th to BB via Park Hill Thompson data