Safety Prediction Models for Six-Lane and One-Way Urban and Suburban Arterials

The publication by AASHTO of the first edition of the Highway Safety Manual (HSM) is an important step forward in providing safety analysis tools for highway agencies. In particular, HSM Part C includes predictive methods that can be used by transportation agencies to anticipate the safety performance of new facilities, to assess the safety performance of existing facilities, or to estimate the expected effectiveness of proposed improvements to existing facilities. However, the first edition of the HSM does not address all facility types of potential interest to transportation agencies. HSM Chapter 12 provides a predictive method for two and four lane urban and suburban arterial facilities with both undivided and divided cross sections. Two facility types that are not addressed in the existing chapter are arterials with six or more lanes and one-way arterial streets. A task force of the AASHTO Subcommittee on Safety Management has reviewed research needs and identified the omission of these facility types as one of the more significant gaps in the first edition of the HSM. Research is needed to develop safety prediction methods for these facility types. The objectives of this research are to (1) develop a predictive method for use in the HSM to address crash frequency and severity for both roadway segments and intersections on arterials with six or more lanes and one-way arterial streets and (2) provide procedures that will assist transportation agencies to consider safety in decisions related to these facilities during widening and modifying existing arterials or designing new facilities. The scope of the research will be limited to urban and suburban highways and streets other than freeways.


  • English


  • Status: Active
  • Funding: $599910
  • Contract Numbers:

    Project 17-58

  • Sponsor Organizations:

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590

    American Association of State Highway & Transportation Officials (AASHTO)

    444 North Capitol Street, NW, Suite 225
    Washington, DC  United States  20001

    National Cooperative Highway Research Program

    Transportation Research Board
    500 Fifth Street, NW
    Washington, DC  United States  20001
  • Project Managers:

    Bush, Mark

  • Performing Organizations:

    Texas A&M Transportation Institute, College Station

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

    Lord, Dominique

  • Start Date: 20130114
  • Expected Completion Date: 20171130
  • Actual Completion Date: 20171130
  • Source Data: RiP Project 38687

Subject/Index Terms

Filing Info

  • Accession Number: 01548224
  • Record Type: Research project
  • Source Agency: Transportation Research Board
  • Contract Numbers: Project 17-58
  • Files: TRB, RiP
  • Created Date: Dec 19 2014 1:01AM