Development of Guidance for Non-Standard Roadside Hardware Installations

Roadside safety hardware is critical for reducing severe crashes on U.S. highways. Roadside safety hardware such as guardrail is crash tested to assess its crashworthiness. The current crash test criteria is contained in the AASHTO Manual for Assessing Safety Hardware (MASH), and all highway agencies are in the process of implementing MASH hardware on their systems. While MASH tested hardware is available for and reduces the risk of severe crashes for the majority of applications, situations may be encountered where the approved roadside safety hardware does not fit the specific location. There is an urgent need to develop guidance for special site-specific designs to guide highway agencies on appropriate hardware use and implementation for these non-standard situations where standard practices of crash tested barrier cannot be used. In absence of this research, the frequency of severe injury and fatal crashes will likely escalate as more miles of roadway with non-standard roadside hardware installations continue to increase. The objectives of this research are to: (1) Identify common non-standard situations that are encountered by highway agencies; (2) Investigate potential crash tested solutions for these situations, if practical; (3) Identify best practices for situations where a crash tested solution may not be practical; and (4) Develop guidelines that agencies can use for these situations. This research will provide guidance to assist state, local, and tribal agencies to provide the most practical solution for non-standard roadside hardware installation conditions. The guidance could be further implemented through an update of appropriate sections of the AASHTO Roadside Design Guide (RDG). Recommended guidance or specific solutions could be incorporated into a future update of MASH. Results of this research and the resulting guidance will be disseminated to state DOT design engineers, consultants, and practitioners through presentations and webinars at appropriate industry and professional meetings.


  • English


  • Status: Proposed
  • Funding: $400000
  • Contract Numbers:

    Project 15-79

  • 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:

    Jared, David

  • Start Date: 20200519
  • Expected Completion Date: 0
  • Actual Completion Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 01739577
  • Record Type: Research project
  • Source Agency: Transportation Research Board
  • Contract Numbers: Project 15-79
  • Files: TRB, RiP
  • Created Date: May 18 2020 3:06PM