Development of guidelines for pedestrian safety treatments at signalized intersections.
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2012-01-01
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Alternative Title:Project title: Development of pedestrian safety-based warrants for protected or protected-permissive left-turn control
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Edition:Technical report; Sept. 2009-Aug. 2011.
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Abstract:For intersections with a permissive or protected-permissive left-turn mode, pedestrians cross during the
permissive period. This operation requires the left-turn driver to yield to both opposing vehicles and
pedestrians, prior to accepting a gap and completing the turn. Pedestrian crash risks are increased in these
complicated driving conditions because left-turn drivers sometimes fail to yield to pedestrians.
This document summarizes the research conducted and the conclusions reached during the development of
guidelines for pedestrian safety treatments at signalized intersections. The guidelines are focused on
treatments that alleviate conflicts between left-turning vehicles and pedestrians. One treatment addressed in
the document is the use of protected or protected-permissive left-turn operation. The guidelines are based on
consideration of pedestrian safety and vehicle operation. These considerations include the road-user costs
associated with pedestrian-vehicle crashes and vehicle delay. The guidelines were incorporated in the Traffic
Signal Operations Handbook. The guidelines were also incorporated into a spreadsheet that was developed
to accompany the Handbook. The Handbook was previously developed for Project 0-5629. It provides
guidelines for timing traffic control signals at intersections that operate in isolation or as part of a
coordinated signal system.
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