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.

• Record URL:
  http://www.dot.state.oh.us/Divisions/Planning/SPR/Research/reportsandplans/Pages/Project_Details.aspx?View={D7C72556-2ABC-4830-BDFF-6C02603A792B}&FilterField1=State%5Fx0020%5FJob%5Fx0020%5F%5Fx0023%5F&FilterValue1=135971

Project

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

  33808

  109462

  135971

• 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

• TRT Terms: Accuracy; Calibration; Crash rates; Estimating; Freeways
• Identifier Terms: Highway Safety Manual; Safety Performance Functions
• Geographic Terms: Ohio
• Subject Areas: Highways; Planning and Forecasting; Safety and Human Factors;

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