Freeway Segment Safety Performance Function (SPF) Development

Ohio is currently using calibrated national Safety Performance Functions for all the site types in AASHTO's Highway Safety Manual (HSM) to make them specific for Ohio. However, the calibrated freeway segment SPFs appear to be performing poorly when estimating peer group and long term average crash frequencies. The freeway SPFs used for predicted and expected crash frequencies need to be refined to increase the accuracy. The goal of this research is to increase reliability of crash estimation on freeway segments.


  • English


  • Status: Active
  • Funding: $224570
  • Contract Numbers:




  • Sponsor Organizations:

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Managing Organizations:

    Ohio Department of Transportation

    Research Program
    1980 West Broad Street
    Columbus, OH  United States  43223
  • Project Managers:

    Nye, Kelly

  • Performing Organizations:

    Vanasse Hangen Brustlin, Incorporated

    333 Fayetteville Street, Suite 1450
    Raleigh, NC  United States  27601
  • Principal Investigators:

    Himes, Scott

  • Start Date: 20191101
  • Expected Completion Date: 20210630
  • Actual Completion Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 01720764
  • Record Type: Research project
  • Source Agency: Ohio Department of Transportation
  • Contract Numbers: 33808, 109462, 135971
  • Files: RIP, STATEDOT
  • Created Date: Oct 28 2019 3:03PM