Enhancing Highway Safety Manual Guidance on Pedestrian and Bicyclist Countermeasures (CMF/SPF Development)

The AASHTO Highway Safety Manual (HSM), first edition, provides analytic tools and techniques for estimating effects of changes to the roadway environment on motor vehicle crashes, but provides almost no information about effects on pedestrian and bicyclist crash frequency. NCHRP Project 17-84, “Pedestrian and Bicycle Safety Performance Functions for the Highway Safety Manual,” is in the process of developing crash modification factors (CMFs) and safety performance functions (SPFs) for pedestrians and bicyclists in support of a future HSM, second edition (see Special Note L below). However, the safety benefits of many pedestrian and bicycle countermeasures, especially newer treatments, will still be unknown after completion of NCHRP Project 17-84. Furthermore, established CMFs focused on vehicle-vehicle collisions do not properly account for effects on pedestrian and bicyclist crash outcomes. The objectives of this research are to: (1) develop CMFs and SPFs related to pedestrian and/or bicyclist safety countermeasures; and (2) assess pedestrian and/or bicyclist safety outcomes associated with vehicle safety countermeasures.


  • English


  • Status: Active
  • Funding: $600000
  • Contract Numbers:

    Project 17-112

  • Sponsor Organizations:

    National Cooperative Highway Research Program

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

    American Association of State Highway and Transportation Officials (AASHTO)

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

    Federal Highway Administration

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

    Zhao, Yi

  • Performing Organizations:

    Texas Transportation Institute

    Texas A&M University System
    3135 TAMU
    College Station, TX  United States  77843-3135
  • Principal Investigators:

    Dadashova , Bahar

  • Start Date: 20240301
  • Expected Completion Date: 20260228
  • Actual Completion Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 01846130
  • Record Type: Research project
  • Source Agency: Transportation Research Board
  • Contract Numbers: Project 17-112
  • Files: TRB, RIP
  • Created Date: May 23 2022 4:28PM