11

Roundabouts Roundabouts

Presented to Township CouncilPresented to Township CouncilJanuary 19, 2008 January 19, 2008

2

AgendaAgenda►ObjectiveObjective►General FeaturesGeneral Features►Traffic ConsiderationsTraffic Considerations►Safety ConsiderationsSafety Considerations►Other ConsiderationsOther Considerations►Public EducationPublic Education►Examples of RoundaboutsExamples of Roundabouts►Roundabouts in LangleyRoundabouts in Langley►Current StatusCurrent Status

3

ObjectiveObjective ►To inform Council of the general To inform Council of the general

features and safety benefits of features and safety benefits of roundabouts roundabouts

►To provide Council an update on the To provide Council an update on the current status of roundabouts within current status of roundabouts within the Townshipthe Township

4

General FeaturesGeneral Features

► Internationally recognized “Traffic Control Internationally recognized “Traffic Control Device”Device”

► Alternative to Traffic SignalsAlternative to Traffic Signals► Province of BC MoT PolicyProvince of BC MoT Policy

"Roundabouts shall be considered as the first option for intersection designs where 4-way stop control or traffic signals are supported by traffic analysis"

BC Ministry of Transportation Supplement to TAC Geometric Design Guide; Section 740.02

5

6

Traffic ConsiderationsTraffic Considerations►Transportation Association of Canada Transportation Association of Canada

(TAC) Warrants(TAC) Warrants based upon traffic based upon traffic conditionsconditions

►Naturally self regulates traffic volumesNaturally self regulates traffic volumes Creates gaps for cross street trafficCreates gaps for cross street traffic

►Lower Operating Speeds through the Lower Operating Speeds through the intersectionintersection Design Speed of 20-40 km/hDesign Speed of 20-40 km/h

7

Traffic ConsiderationsTraffic Considerations► Intersection CapacityIntersection Capacity

Similar to a signalized intersection with left turn Similar to a signalized intersection with left turn laneslanes

Approximately 25,000 vehicles per dayApproximately 25,000 vehicles per day► Intersection PerformanceIntersection Performance

Level of Service (LOS), average vehicle delay, and Level of Service (LOS), average vehicle delay, and volume/capacity ratio (v/c) similar to signalized volume/capacity ratio (v/c) similar to signalized intersection with left turn lanesintersection with left turn lanes

►Truck Traffic, buses and emergency Truck Traffic, buses and emergency vehicles can be accommodatedvehicles can be accommodated

8

► Turning Turning Movement Movement AnalysisAnalysis

► WB – 20WB – 20 Largest TruckLargest Truck Widest TurnsWidest Turns Larger turns than Larger turns than

farm vehicles, farm vehicles, fire trucks or tour fire trucks or tour busesbuses

9

Roundabout Safety FeaturesRoundabout Safety FeaturesFewerFewer turning movement turning movement conflictsconflicts result in result in fewer fewer collisionscollisionsCreates gaps in trafficCreates gaps in traffic which benefits cross which benefits cross streetsstreetsFunctions during power outagesFunctions during power outagesSafer pedestrian/equestrianSafer pedestrian/equestrian environment with environment with raised curb and sidewalk and marked crosswalksraised curb and sidewalk and marked crosswalksRaised Splitter Island provide Raised Splitter Island provide refuge area for refuge area for pedestrian/equestrianpedestrian/equestrian and channel vehicles in the and channel vehicles in the correct directioncorrect directionRaised Center Circle and Truck Apron Raised Center Circle and Truck Apron reduce reduce travel lane width which slows vehicle but still travel lane width which slows vehicle but still accommodates truckaccommodates truck traffic traffic

10

Safety Benefit – Reduced Conflict PointsSafety Benefit – Reduced Conflict Points

11

Safety Performance of RoundaboutsSafety Performance of Roundabouts

Source: ICBC Guide: Modern Roundabouts in BCSource: ICBC Guide: Modern Roundabouts in BC

12

Roundabout Safety BenefitsRoundabout Safety Benefits

13

Roundabout Safety BenefitsRoundabout Safety Benefits

14

Other ConsiderationsOther Considerations► Construction and Maintenance BenefitsConstruction and Maintenance Benefits

Lower operating cost due to lack of signal maintenance Lower operating cost due to lack of signal maintenance Lower construction cost due to similar land requirements and Lower construction cost due to similar land requirements and no high cost traffic signal equipmentno high cost traffic signal equipment

► Other BenefitsOther Benefits-Reduced Idling resulting in lower tailpipe emissionsReduced Idling resulting in lower tailpipe emissions-Less delay to motorist due to the lack of required to stop at a Less delay to motorist due to the lack of required to stop at a signalsignal-Less fuel consumption due to more efficient operationsLess fuel consumption due to more efficient operations-Does not require hydro to functionDoes not require hydro to function

15

Public EducationPublic Education

16

17

18

Examples of RoundaboutsExamples of Roundabouts

19

West VancouverWest Vancouver

20

West VancouverWest Vancouver

21

EuropeEurope

22

EuropeEurope

23

Roundabouts in LangleyRoundabouts in Langley

24

Murray’s CornerMurray’s Corner

25

216 St at 50 Ave216 St at 50 Ave

26

216 St at 50 Ave216 St at 50 Ave

27

201 St at 100A Ave201 St at 100A Ave

28

64 Ave at 216 St64 Ave at 216 St

29

56 Ave at 232 St56 Ave at 232 St

30

16 Avenue at 248 Street16 Avenue at 248 Street

31

16 Avenue at 216 Street16 Avenue at 216 Street

32

Current Status Current Status ►Murray’s CornerMurray’s Corner

Completed and in operationCompleted and in operationPositive feedback on functionality and designPositive feedback on functionality and design

►50 Ave/216 St 50 Ave/216 St Substantially complete and operating as a roundaboutSubstantially complete and operating as a roundaboutRequires final top lift of pavementRequires final top lift of pavement

►201 St at 100A Avenue 201 St at 100A Avenue Under constructionUnder constructionWork being undertaken as part of the Golden Ears Bridge Work being undertaken as part of the Golden Ears Bridge ProjectProject

►64 Ave at 216 St –64 Ave at 216 St –Conceptual plan completedConceptual plan completedPart of the 64 Ave/ Mufford Crescent Overpass projectPart of the 64 Ave/ Mufford Crescent Overpass project

33

Current Status Current Status ►56 Ave at 232 St56 Ave at 232 St

Conceptual Plan completedConceptual Plan completedLand acquisition and detailed design underwayLand acquisition and detailed design underwayOverhead Utility conflicts need to be addressedOverhead Utility conflicts need to be addressed

►16 Ave at 248 St16 Ave at 248 StConceptual Plan completedConceptual Plan completedProject deferred pending the completion and evaluation of Project deferred pending the completion and evaluation of other roundabouts on 16 Aveother roundabouts on 16 Ave

►16 Ave at 216 St 16 Ave at 216 St Detail design completedDetail design completedLand Acquisition completedLand Acquisition completedAwaiting TransLink approval for transfer of fundsAwaiting TransLink approval for transfer of funds

34

Thank YouThank You