United States Department of Transportation
i
Regionalized Urban-suburban Collector Road Safety Performance Functions
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2019-03-14
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[PDF-4.40 MB]
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Abstract:The purpose of this project was to estimate regionalized safety performance functions (SPFs) for urban and suburban collector roads and at-grade intersections using roadway inventory and crash data from state-owned roadways in Pennsylvania. Five years of crash data (2013-2017) were appended to traffic volume and roadway and roadside features in order to estimate statistical models of total and fatal + injury crash frequency. SPFs were developed for two-lane undivided roadway segments and the following at-grade intersections types: three-leg intersections with stop-control on the minor approach; three-leg intersections with all-way stop control; four-leg intersections with stop-control on the minor approach, four-leg intersections with all-way stop control; and four-leg signalized intersections. Based on the regionalization process, engineering district-level SPFs with county-level adjustments were recommended for two-lane undivided roadway segments. Statewide SPFs were recommended for three-leg all-way stop controlled, four-leg minor-street stop-controlled, four-leg all-way stop-controlled and four-leg signalized intersections. Statewide SPFs with district-level adjustments were recommended for three-leg minor-street stop-controlled intersections.
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