Project Goals Project Outcomes - Seattle · that bridge in December, 2011 – and the greatest...
Transcript of Project Goals Project Outcomes - Seattle · that bridge in December, 2011 – and the greatest...
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NE 125th Street Rechannelization Before and After Report
Project Goals
Improvetrafficsafety
Increasecompliancewiththespeedlimit
Improvepedestrianandbicycleaccess
Project Outcomes
Declineintherateoftotalcollisionsand injurycollisions
Reductioninthenumberofpeopleexceeding speedlimit
Reductioninpedestrianandbicyclecollisions
Background
InMay,2011theSeattleDepartmentofTransportationreconfiguredthelanesonNE125thStreetbetweenRooseveltWayNEand30thAvenueNEtomakethestreetsaferforeveryone,supportbuses,andmaketrafficflowmoresmoothly.Priortotherechannelizationthereweretwotravellanesineachdirection.Thestreetwasreconfiguredtoprovideonelaneineachdirection,anewtwo-wayleftturnlane,andbicyclelanes.SDOTagreedtomonitortheproject’simpactonsafetyandtrafficaftertherechannelizationwascompleted.
NE 125th Street Before
NE 125th Street After
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NE 125th Street Rechannelization Before and After Report
Speed
Speeddataismeasuredatthespeedmostdriversarecomfortabledriving(the85thpercentile),thenumberofdriversexceedingthespeedlimit(30mph)andthenumberofaggressivespeeders,ordriversexceedingthespeedlimitbyatleast10milesperhour(40mph).Highspeedscanbeakeycontributingfactortothecollisionandinjuryratesoncitystreets.Highspeedsreducedriverawareness,andcreatemoreseverecollisions.Forexample,ifavehiclehitsapedestrianwhilegoing40milesperhourthepedestrianhasaslimchanceofsurvival.Reducingvehiclespeedgreatlyimprovespedestriansafety.
SDOTmeasuredspeeddatanear20thAvenueNE.Thelocationisfiveblocksfromthefullsignalat15thAvenueNEandfiveblocksfromthepedestriansignalat25thAvenueNE.Priortotheproject,the85thpercentilespeedwas41mpheastbound(whichisdownhill)and39mphwestbound(uphill).Eighty-sevenpercentofdriversweretravelingoverthespeedlimit.16percentofdriverswerespeedingat40mphormore-morethan10mphoverthespeedlimit.
Sincetheprojectwascompleted,mostdriversarestillabletotravelatorabovethespeedlimit.The85thpercentileisnow38mpheastboundand36mphwestbound.Therehasbeenan11percentdecreaseinthepercentageofpeopleexceedingthespeedlimit.Andtherehasbeenanevenmoredramatic69percentdecreaseinthepercentofdriversspeedingmorethan10milesoverthespeedlimit.
Theseaggressivespeedersaremostlikelytocausedeathorinjuryintheeventofacollision.
Thefactthatmostdriverscontinuetoexceedthespeedlimitindicatesthattraffichasnotcometoastandstillbutrathercontinuestobefree-flowingmostoftheday.
NE 125TH STREET SPEED
BEFORE AFTER CHANGE
85th Percentile 40.0 36.9 -8%
Eastbound 41.4 38.0 -8%
Westbound 38.6 35.7 -8%
Driving Faster Than 30 87% 77% -11%
Eastbound 92% 85% -8%
Westbound 83% 68% -18%
Driving Faster Than 35 51.6% 29% -44%
Eastbound 62.3% 38.6% -38%
Westbound 40.8% 19.5% -52%
Driving Faster Than 40 16% 4.9% -69%
Eastbound 22.4% 7.3% -67%
Westbound 9.5% 2.5% -74%
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NE 125th Street Rechannelization Before and After Report
Volume
Aftertheprojectwascompleted,motorvehicletrafficonNE125thStreetincreasedsignificantlybetweenLakeCityWayand30thAvenueNE.Furthereasttrafficvolumeisroughlythesameasitwasbeforetheproject.Takentogether,thedataindicatesthattrafficvolumeoverallhasincreasedroughly10percentonNE125thStreet.OnepossiblefactorinexplainingthisincreasemaybetrafficdiversionsimmediatelyfollowingtheintroductionoftollingontheSR520floatingbridge.TollingbeganonthatbridgeinDecember,2011–andthegreatestincreaseintrafficon NE125thStreetappearedimmediatelyaftertollingbegan.
NE 125TH STREET MOTOR VEHICLE VOLUME
Between Lake City Way & 30 Avenue NE
June 2009 January 2012 Change
DailyWeekday 11,089 14,819 +34%
AMPeakHour 364 527 +45%
PMPeakHour Westbound
485 717 +48%
NE 125TH STREET MOTOR VEHICLE VOLUME
Between 26th Avenue NE & 27th Avenue NE
September 2009 February 2013 Change
DailyWeekday 16,209 15,574 -4%
AMPeakHour 518 536 +3%
PMPeakHour 720 722 (<)+1%
PedestrianandbicyclevolumewascountedattheintersectionofNE125thStreetand30thAvenueNE.ThecountswereconductedonMarch16,2005andagainatthesamelocationonJanuary31,2012. Onbothdays,rainwasrecordedinSeattle.BothbicycleandpedestriancountstendtobelowerinthewintersothissnapshotprovidesaconservativeestimateofthenumberofpedestriansandbicyclesusingNE125thStreet.
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NE 125th Street Rechannelization Before and After Report
NE 125TH STREET BICYCLE AND PEDESTRIAN VOLUME
5-hour Count (7-9am; 1-2pm; 4-6pm)
March 16, 2005 January 31, 2012 Change
HighTemp56Precipitation0.14”
HighTemp49Precipitation0.03”
Bicyclesalong NE125thStreet
7 15 +114%
Pedestriansin thecrosswalks
330 676 +105%
Thelargeincreaseinpedestrianandbicyclevolumemaybepartiallyexplainedbynearbylandusechanges.Thenortheastcornerofthisintersectionwasredevelopedin2007andBartellsDrugStoremovedtothatlocation.TheLakeCityBranchofSeattlePublicLibrary,whichisoneblockaway,wasexpandedandremodeledin2005.
LakeCityisdesignatedanUrbanVillagebytheCityofSeattle.UrbanVillagesareexpectedtoabsorbmostofthegrowthinpopulationandjobs.AccordingtotheSeattleDepartmentofPlanningandDevelopment(DPD),thenumberofjobsinLakeCitygrew20percentbetween2004and2010.ThepopulationofLakeCitygrew43percentbetween2000and2010–aratemuchhigherthanthecitywide8percentpopulationgrowthduringthesameperiod.Accordingtoa2012reportbyPugetSoundRegionalCouncil,thepopulationofLakeCityisanticipatedto
growanother30percentandemploymentby85percentby2040.TheadditionaltripsgeneratedbymorepeopleworkingandlivinginLakeCityarelikelytoresultinevengreaterincreasesinthenumberofpeoplewalkingandbikingalongNE125thStreetinthefuture.
Collisions
Therateofcollisionsandtherateofinjurycollisionshavedeclinedsincetheprojectwascompleted.Thenumberofinjurycollisionspermonthdecreased.Themostpronounceddeclinesoccurredincollisionsinvolvingpeoplewalkingorbikingandfatalityandhead-oncollisions.Despitetheincreaseintrafficvolume,therateofcollisionshasdecreasedby10percent.ThesefindingsaresimilartoarecentFederalHighwayAdministration(FHWA)study(“EvaluationofLaneReduction‘RoadDiet’MeasuresonCrashes”)whichstudied30streetreconfigurationsinWashingtonandCaliforniaandfounda19percentreductioninthecollisionrateafterconversionfromfour-lanetothreelaneroadwayconfiguration.
COLLISION RATE
Before After Change
Collisionsper millionvehicles
5.83 5.24 -10%
Injurycollisions permillionvehicles
2.41 1.99 -17%
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NE 125th Street Rechannelization Before and After Report
Conclusions
ReconfiguringthelanesonNE125thStreethasmadeitsaferforeveryonetravelingalongthisstreet.Thesafetybenefitisespeciallyprominentforpeoplewalkingandbiking.Theprojectdramaticallyreducedthenumberofpeoplewhoaredrivingmorethan10milesoverthespeedlimit.Evenastrafficvolumehasincreased,therateofcollisionshasfallen10percent.Bicycleandpedestrianvolumehasincreasedalongthisstreetanditisexpectedtoincreaseevenmoreinthecomingyearsasthecitygrows.Theprojectaffordstheopportunitytoinstallnewmarkedcrosswalks–somethingSDOTisplanningtodoat20thAvenueNEadjacenttoachurchandpreschool.Thenewconfigurationofthestreetgivespeopleadditionalchoicesforhowtogetaround.Anditprovidesanadditionalwaytoencouragenewtripstobemadebywalking,bikingandtakingtransit.