Research for AASHTO Standing Committee on Highways. Task 401. Addressing Roadside Safety: A Systemic Approach to Hardware Replacement Analysis to Support MASH Implementation

The objective of this project was to develop a guide for highway agencies to establish (a) priorities for upgrading existing safety hardware to standards in the Manual for Assessing Safety Hardware (MASH) 2016; and (b) policy on how such upgrading should occur. Implicit in this discussion is the recognition that just because crash test procedures and evaluation criteria change does not mean that hardware developed using earlier criteria suddenly becomes unsafe. The process of improving roadside safety hardware is an incremental process where each generation of hardware is thought to be slightly more effective than the previous generation. Prioritizing upgrading policies involves assessing the incremental reduction in the risk of fatal and serious injury expected from upgrading roadside hardware and balancing that risk reduction with the highway agency costs of upgrading the hardware such that funds are expended to maximize overall network safety. Appreciating the underlying risk reductions and costs of upgrading are fundamental to developing effective upgrading policies. The systematic data-driven process for roadside hardware replacement analysis described in this user’s guide is not meant to be prescriptive but informative. Engineers are likely to use this process as part of the decision-making process in combination with engineering judgment, agency experience, in-service performance history, and other highway agency objectives. The method presented herein is just one of several considerations that should be included in making roadside hardware replacement decisions. A highway agency may also consider ease of maintenance issues, stock-piling materials, project scheduling, contractor familiarity with various designs and other issues. The method presented herein, therefore is one facet of the decision-making process but should be used in conjunction with other considerations.  


  • English


  • Status: Completed
  • Funding: $100000
  • Contract Numbers:

    Project 20-07, Task 401

  • Sponsor Organizations:

    National Cooperative Highway Research Program

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

    Federal Highway Administration

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

    American Association of State Highway and Transportation Officials (AASHTO)

    444 North Capitol Street, NW
    Washington, DC  United States  20001
  • Performing Organizations:

    Roadsafe LLC

  • Principal Investigators:

    Ray, Malcolm

  • Start Date: 20190104
  • Expected Completion Date: 20200904
  • Actual Completion Date: 20200904

Subject/Index Terms

Filing Info

  • Accession Number: 01763102
  • Record Type: Research project
  • Source Agency: Transportation Research Board
  • Contract Numbers: Project 20-07, Task 401
  • Files: TRB, RIP
  • Created Date: Feb 1 2021 3:58PM