Crash reductions related to traffic signal removal in Philadelphia

Crash reductions related to traffic signal removal in Philadelphia

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Article ID: iaor19982548
Country: United Kingdom
Volume: 29
Issue: 6
Start Page Number: 803
End Page Number: 810
Publication Date: Nov 1997
Journal: Accident Analysis and Prevention
Authors: , , , ,
Keywords: transportation: road
Abstract:

The effect on intersection crashes of converting one-way street intersections in Philadelphia from signal to multiway stop sign control was estimated. Using crash and traffic volume data for a comparison group, regression models were computed to represent the normal crash experience of signal controlled intersections of one-way streets, by impact type, as a function of traffic volume. An empirical Bayesian procedure was used to estimate what would have been the expected number of crashes at the converted intersections had they not been converted. The empirical Bayesian estimates were compared with actual counts of crashes after conversion. Estimates were obtained for different classes of crashes categorized by impact type, day/night condition, and impact severity. Aggregate results indicate that replacing signals by multiway stop signs on one-way streets is associated with a reduction in crashes of approximately 24%, combining all severities, light conditions, and impact types.

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