Evaluation of Safety Strategies at Signalized Intersections (2011) / Chapter Skim
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The objective of this project was to evaluate the safety effectiveness for selected strategies identified in NCHRP Report 500: Guidance for the Implementation of the AASHTO Strategic Highway Safety Plan, Volume 12: A Guide for Reducing Collisions at Signalized Intersections (Antonucci et al., 2004)
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• Protected phasing, • Protected-permissive phasing, • Modify phasing and add left-turn lane, • Add left turn only, • Lengthen left-turn lane, • Dynamic advance warning flashers, • Optimize clearance intervals, and • Flashing yellow arrow. Tier II (lower priority)
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To evaluate the safety of converting from signalized intersections to roundabouts, the before-after EB method was used to evaluate treatments in Colorado, Florida, Indiana, Maryland, Michigan, North Carolina, New York, South Carolina, Vermont, and Washington. A disaggregate analysis was conducted to identify differential effects based on specific site characteristics (e.g., traffic volume, area type, and number of approaches)
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At both the intersection and approach levels, there were small percentage increases in rear-end crashes, which was statistically significant at the 0.05 level, when the results of the two jurisdictions are combined. To evaluate the safety of implementing flashing yellow arrow for permissive left turns, data from urban areas in Oregon, Washington, and North Carolina were used.
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