Calibration and Development of State-DOT-Specific Safety Performance Functions

By: National Academies of Sciences, Engineering, and Medicine and Transportation Research Board and National Cooperative Highway Research Program and Eric T. Donnell and Jakob C. Wiegand and Vikash V. Gayah

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Synopsis: Roadway safety management is a multi-step process that begins with screening a roadway network for sites with potential for safety improvement. Subsequent steps in the process include diagnosing safety problems at candidate sites, identifying countermeasures for implementation, conducting an economic appraisal of the countermeasures, prioritizing sites for safety improvement, and evaluating the safety effectiveness of countermeasure implementation. NCHRP Synthesis 634: Calibration and Development of State-DOT-Specific Safety Performance Functions, from TRB's National Cooperative Highway Research Program, documents state departments of transportation practice on calibration factors and the development of jurisdiction-specific safety-performance functions.

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