United States Department of Transportation
i
Developing Safety Performance Functions for Utah Roadways and Intersections
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2024-01-01
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[PDF-8.84 MB]
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Edition:Final Jan 2023 to Jan 2024
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Abstract:The Highway Safety Manual (HSM), published by the American Association of State Highway and Transportation Officials (AASHTO) provides guidance as to the development of predictive models used to estimate the predicated average crash frequency for a particular site using regression models developed from data for similar sites across a network. These regression models are called safety performance functions (SPFs) and are introduced in the HSM for base conditions and base geometry. Although the HSM Part C includes SPFs for base conditions of a variety of roadway types, the HSM recommends developing jurisdiction-specific SPFs whenever possible to provide the most accurate models for crash prediction. To provide a more accurate representation of crashes across the state of Utah, the purpose of this project was to use existing crash data to develop state-specific SPFs.
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