Updating Safety Performance Functions for Data-Driven Safety Analysis

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.

• Record URL:
  http://apps.trb.org/cmsfeed/TRBNetProjectDisplay.asp?ProjectID=4575
• Supplemental Notes:
  • Concluded following Phase 1 of Project.

Language

• English

Project

• Status: Completed
• Funding: $500000
• Contract Numbers:

  Project 17-93

• Sponsor Organizations:

  American Association of State Highway and Transportation Officials (AASHTO)

  444 North Capitol Street, NW
  Washington, DC  United States  20001

  National Cooperative Highway Research Program

  Transportation Research Board
  500 Fifth Street, NW
  Washington, DC  United States  20001

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Project Managers:

  Dekelbab, Waseem

• Performing Organizations:

  University of North Carolina at Chapel Hill

  UNC-CH New East Building
  Campus Box #3140
  Chapel Hill, North Carolina  United States  27599-3140
• Principal Investigators:

  Srinivasan, Raghavan

• Start Date: 20190701
• Expected Completion Date: 20221231
• Actual Completion Date: 20221231

Subject/Index Terms

• TRT Terms: Crash modification factors; Crash rates; Crash risk forecasting; Crash severity; Data analysis; Mathematical prediction; Traffic crashes; Traffic safety
• Identifier Terms: American Association of State Highway and Transportation Officials; Highway Safety Manual; Safety Performance Functions
• Subject Areas: Data and Information Technology; Highways; Planning and Forecasting; Safety and Human Factors;

Filing Info

• Accession Number: 01672554
• Record Type: Research project
• Source Agency: Transportation Research Board
• Contract Numbers: Project 17-93
• Files: TRB, RIP
• Created Date: Jun 19 2018 11:33AM