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.
STATUS
The project concluded following Phase 1. The interim report and other deliverables are available below:
