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American Public Works Association
Thursday, November 19, 2015
Building a Better World for All of Us®
Pedestrian Crossing Safety Rectangular Rapid Flashing Beacons (RRFB) Ryan Peterson, PE City of Burnsville Tom Sohrweide, PE, PTOE SEH Inc.
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Agenda • Background • Location • Concern • Issues • Solutions • Rectangular Rapid Flashing Beacon • Design • Data • Lessons Learned • Cost • Questions
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Background
• Hospital Expansion
• Problem
– Relocated Employee Parking
• Need to cross 4-Lane Roadway
– 9,600 AADT
– 30 MPH Speed Limit
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Location
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Location
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Concern
S A F E T Y
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Issues
• Not an existing situation
• Need to cross 4-lane roadway
– 9,600 AADT
• Will pedestrians use crosswalk
• Is there a need for 2 crosswalks
– Midblock
• Sight distance for drivers
– Roadway
– At crosswalk
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Solution Options
• Standard crossing protection
– Marked crosswalk
– Signing (standard / LED border)
– Flashing beacons
• Traffic Signal (HAWK)
• Rectangular Rapid Flashing Beacon (RRFB)
• In-pavement flashers
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Solution Concerns
• Standard crossing protection
– Is it enough?
• Traffic Signal (HAWK)
– Desirable to have more than one crossing
location
– Pedestrian delay
• Rectangular Rapid Flashing Beacon (RRFB)
– What?
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What is a Rectangular Rapid
Flashing Beacon?
• A dual flasher that uses an irregular flash
pattern that is similar to emergency flashers
on police vehicles
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Rectangular Rapid Flashing Beacon
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Are RRFBs Effective?
• Study data complied from Florida, Illinois,
and Washington DC
– Yielding compliance increased from 18% to 81%
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Design
• 2 Crosswalks
• Advance pedestrian crossing signs
• Pedestrian crossing signs (right side & median)
• Pedestrian actuated RRFB below pedestrian crossing signs
• “STOP Here for Pedestrian” signs in advance of crosswalk
• Stop bars
• In-pavement flashers
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Crosswalk Locations
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Installation
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Installation
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Crossing Video
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Pedestrian Crossing Observations
• Tuesday, August 19, 2014
– 11:50 AM – 12:50 PM
• Wednesday, August 27, 2014
– 2:38 PM – 3:38 PM
• Tuesday, September 15, 2015
– 11:30 AM – 1:00 PM
• Wednesday, September 30, 2015
– 2:02 PM – 3:11 PM
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Pedestrian Crossing Data
2014 2015
No. of Observed Crossings 185 107
- Pushed Button 82% 85%
- Didn't Push Button 16% 15%
- Didn't Use Crosswalk 2% 0%
Vehicles Present During Crossing 72% 85%
Vehicles Stopped for Pedestrians 96% 95%
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Lessons Learned
• Pedestrians need to be aware
• Drivers will stop unnecessarily for the “STOP
for Pedestrian” signs
• MUTCD Interim Approval – Inform MnDOT of
location
• Installed in other locations
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Cost
• System described
– With concrete crosswalks
– $65,000 per crosswalk
• Similar location
– No concrete or in-pavement flashers
– $25,000 per crosswalk
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Questions?