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How did the Bicyclist Cross the Road?. A Case Study of Two Intersections in Seattle. By: Mike Hendrix, PE, PTOEDate: June 26, 2012. Seattle Bike Master Plan. A blueprint for making improvements to Seattle’s bicycle network Adopted in 2007 Seattle BMP Goals: Triple bicycling by 2017 - PowerPoint PPT Presentation
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How did the Bicyclist Cross the
Road?
By: Mike Hendrix, PE, PTOE Date: June 26, 2012
A Case Study of Two
Intersections in Seattle
Seattle Bike Master Plan
A blueprint for making improvements to Seattle’s bicycle network
Adopted in 2007
Seattle BMP Goals:
Triple bicycling by 2017 Reduce bicycle collisions by 1/3
between 2007 and 2017
Seattle Bike Master Plan
Seattle BMP Accomplishments:
Installed 129 miles of on-street facilities including bike lanes and sharrows
Added over 9 new miles of multi-use trail improvements
Implemented 98 miles of signed bicycle routes
Installed over 2,200 bicycle parking spaces
Case Study
What? Analysis of 2 intersections before and after
signal installation Both intersections were along a neighborhood
greenway Signals weren’t warranted based on MUTCD
criteria
Why? To determine if the traffic signals
installed along this neighborhood greenway improved conditions – for ALL users
Case Study
Determined changes in volumes
Determined changes in collisions
Observed operational issues
Background
Unwarranted signals are BAD. They:
Increase collisions Increase red-light running Increase delay Increase noise and air pollution Lead to increased maintenance costs Lead to a potential increase in cut-
through traffic
Background
2011 Pinellas County Study:273% annual increase in collisions 2008 Kentucky Study:28.3% increase in collisions221.7% increase in rear-end collisions 1989 New York City Study:65% increase in collisions 1979 Purdue University Study3,200 to 4,200 vehicle hours of delay
General Site Conditions
Site 1Fremont Ave N & N 80th St
Fremont Ave N – 25’ wide residential street
N 80th St – 1 lane each direction with on-street parking on north side
15,500 vpd (N 80th St)
700 vpd (Fremont Ave N)
Signal turn-on 11/16/2007
Site 2Fremont Ave N & N 105th St
Fremont Ave N – 25’ wide residential street
N 105th St – 2 lanes each direction with no on-street parking
23,000 vpd (N 105th St)
900 vpd (Fremont Ave N)
Signal Turn on 10/7/2010
Signing and Markings
Span Wire Sign Pavement Marking
Pre-Signal Conditions
Pre-Signal Warrant Summary
At N 80th Street At N 105th Street
Signal Warrants Not Met Not Met
PHB Warrants Not Met Met
Caltrans Bike Warrant Not Met Not Met
Fremont & N 80th StBefore Collision History
3 Years BeforeCorrectable Crashes 11
Non-Correctable Crashes 2
Crash Rate (Crashes per MEV) 0.751
Severity Index 1.77
Fremont & N 105th StBefore Collision History
3 Years BeforeCorrectable Crashes 3
Non-Correctable Crashes 5
Crash Rate (Crashes per MEV) 0.314
Severity Index 1.25
Delay
Intersection
Pedestrian Delay
(seconds)
Motor Vehicle Side Street
Delay (seconds)
Bikes as Motor Vehicles Side Street Delay
(seconds)Bikes as
Pedestrians Side Street
Delay (seconds)
NB SB NB SB
Fremont Ave N & N 80th St 237.2 32.5 27.2 Not Available 52.2
Fremont Ave N & N 105th St 5,297.9 44.8 53.4 124.5 109.4 247.0
Post-Signal Conditions
Post-Signal Warrant Summary
At N 80th Street At N 105th Street
Signal Warrants Not Met Not Met
PHB Warrants Met Met
Caltrans Bike Warrant Not Met Met
Fremont Ave N & N 80th StAfter Collision History
3 Years Before 3 Years AfterCorrectable Crashes 11 0
Non-Correctable Crashes 2 3
Crash Rate (Crashes per MEV) 0.751 0.200
Severity Index 1.77 1.00
Fremont Ave N & N 105th StAfter Collision History
3 Years Before 1 Year AfterCorrectable Crashes 3 0
Non-Correctable Crashes 5 1
Crash Rate (Crashes per MEV) 0.314 0.122
Severity Index 1.25 1.00
Volume Changes
IntersectionBicyclists Pedestrians Motor Vehicles
Before After Before After Before AfterFremont Ave N & N 80th St N/A 14 2 17 72 69
Fremont Ave N & N 105th St 21 52 10 20 77 85
Operational Issue: Violations
Fremont Ave N & N 80th St NB: 12.8% (23 cars) SB: 14.1% (22 cars)
Fremont Ave N & N 105th St NB: 13.5% (38 cars) SB: 12.9% (30 cars)
Operational Issue: Hot Spot Marking
Fremont Ave N & N 105th St
27 of 232 (11.6%) bicyclists went directly for pedestrian push button.
Fremont Ave N & N 80th St
Roughly same proportion
Summary
Neither signal met 2009 MUTCD signal warrants. Both met PHB warrants in the after condition.
Collisions and collision rates decreased at both signals following signal installation.
Severity of collisions at both signals decreased following the signal installation.
Summary
Bike and pedestrian volumes increased while motor vehicle volumes remained relatively constant.
Significant portion of motorists observed violating turning restrictions.
Observed significant misunderstanding of “Hot Spot” markings by bicyclists.
Thank you for your time!
Questions?
Contact InformationMike Hendrix, PE, PTOEmhendrix@perteet.com206-436-0515
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