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The National Academies

NCHRP 17-93 [Final]

Updating Safety Performance Functions for Data-Driven Safety Analysis

  Project Data
Funds: $500,000
Research Agency: University of North Carolina - Chapel Hill
Principal Investigator: Dr. Raghavan Srinivasan
Effective Date: 7/1/2019
Completion Date: 12/31/2022

OBJECTIVES
 
The objectives of this research were to (1) determine how frequently Safety Performance Factors (SPFs), SPF adjustment factors (also called Crash Modification Factors (CMFs) in Part C of the Highway Safety Manual), and Severity Distribution Functions (SDFs) should be updated; (2) determine under what conditions (e.g., changes in data and statistical properties) that SPFs, SPF adjustment factors, and SDFs require updates; and (3) develop an implementable approach and guidance for maintaining and updating existing and future functions and factors. 
 

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