Innovative Intersections Presentation by Andrew O Brien

Transcription

1 Innovative Intersections Presentation by Andrew O Brien Prepared for: ITE ANZ Thursday, 5 November 2015

2 Diverging Diamond Interchanges Background Hoddle St/Eastern Freeway Southern Motorway/Ellerslie-Panmure Hwy, Auckland 2

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4 Diverging-Diamond Interchanges MnDOT is constructing Diverging Diamond Interchanges throughout the state. These interchanges: Cut overall traffic delays up to 60 percent Improve safety by eliminating standard intersection geometrics and conflict points Provide better traffic operations and show some excess capacity 20 years into the future 4

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6 Hoddle Street Diverging-Diamond Option Response to other s pessimism: I have designed several DDIs Just returned from conference in USA and held discussions with TE s involved with DDIs Limited research shows safety improvements Design guides are just that and are untested No histories of head-on crashes Main concern is left turn slip lanes from off-ramps 6

7 Hoddle Street Diverging-Diamond Option Basic option 7

8 Hoddle Street Diverging-Diamond Option Basic option saves $25-40 m, no acquisition 8

9 Southern Motorway/ Ellerslie-Panmure Highway The issues: Long queues blocking the roundabout (rotary) due to motorway congestion. Looked at a range of options to get nonmotorway traffic across the motorway Daniel Dryland of Resolve Group suggested a DDI DDI offered a way of keeping one lane free of queues on approaches and in the roundabout OBT carried out various analyses and microsimulation that demonstrated considerable benefits 9

10 Southern Motorway/ Ellerslie-Panmure Highway 10

11 Southern Motorway/ Ellerslie-Panmure Highway 11

12 Southern Motorway/ Ellerslie-Panmure Highway 12

13 Southern Motorway/ Ellerslie-Panmure Highway 13

14 Southern Motorway/ Ellerslie-Panmure Highway 14

15 Interesting Intersections MacRobertsons Bridge signalised, semi-turbo Turbo-roundabout WA Beach Road, Black Rock roundabout The MUT PHE/Clayton 15

16 MacRobertsons Bridge northern roundabout The issues: Long queues on most approaches Southern roundabout has DoS of about 0.7 Delays of up to 20 minutes to get into the southern roundabout from east, south, or west in the AM peak Cyclist blackspot The concept: Separate lanes on some approaches Meter entries 16

17 MacRobertsons Bridge northern roundabout 17

18 MacRobertsons Bridge northern roundabout 18

19 Turbo-Roundabouts 19

20 Turbo-Roundabouts 20

21 Turbo-Roundabouts The concept: Separate 21

22 Mandurah roundabout Freeway terminal 22

23 Place hook turn box here The hook turn box provides for a cyclist making a right turn from the west to wait before crossing the eastern exit to head south. (This is what many cyclists do at signals (see Austroads). In effect, the cyclist crosses the northern entry to the northern bike lane entry, then re-enters the roundabout as if the cyclist had arrived from the north.

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26 Beach Road roundabouts 26

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31 Intersections with Trams Mt Alexander Road/Ormond Road Toorak Road Tram Terminus Toorak Village 31

32 Mt Alexander Rd/Ormond Rd intersection Observations 14 March: AM peak queues back about 200 m on northern approach Most others OK PM peak Generally congested queues to east as far back as freeway Queuing back from Moonee Ponds junction Queues to south at times to Fenton Street Heavy right turn south to east 32

33 Mt Alexander Rd/Ormond Rd intersection SIDRA analysis: PM Peak Scenario SIDRA DoS Adjusted Dos Existing conditions right turn lane from south right turn from south vph (S) right turn from south vph (E) right turn from south vph (E) right turn from south vph (s)

34 Mt Alexander Rd/Ormond Rd intersection 34

35 Toorak Village moveable bicycle lanes

36 Toorak Village moveable bicycle lanes

37 Lane lights 37

38 Toorak Village moveable bicycle lanes

39 Toorak Road Tram Terminus

40 Toorak Road Tram Terminus

41 Toorak Road Tram Terminus

42 Toorak Road Tram Terminus

43 Toorak Road Tram Terminus

44 Innovation, NZ 44