Development of MASH Full-Scale Test Matrices for Additional Roadside Safety Devices

The Manual for Assessing Safety Hardware (MASH) has developed test matrices for various hardware based on an approach of “worst practical conditions.” This approach is based on selecting the worst or most critical conditions when defining a test matrix. Tests within a matrix need to evaluate different vehicle types, impact conditions, failure types and vary the evaluation criteria. A matrix also needs to allow multiple design alternatives for a roadside feature. Finally, test matrices must also be practical such that roadside features evaluated through the test matrix are cost effective and provide increased safety benefit without being a financial burden to end users. While MASH has matrices for most roadside features, several devices lack a matrix, or the matrix needs clarity. There are no formal procedures to develop or evaluate a new matrix, nor are there procedures to evaluate or update an existing matrix. This lack of procedure makes it difficult for AASHTO’s Technical Committee on Roadside Safety (TCRS) to balance safety, cost, and practicality. The objective of this research project is to develop potential methodologies and procedures to evaluate the (a) newly developed matrices; and (b) modification of test matrices. The developed methodologies and procedures would be applied to selected devices to develop or modify test matrices for them. Methodologies and procedures to evaluate new matrices and modify existing one could improve the effectiveness of roadside features, increase efficiency in developing and maintaining matrices, and provide a consistent and defendable roadside hardware evaluation process.


  • English


  • Status: Proposed
  • Funding: $500000
  • Contract Numbers:

    Project 22-57

  • 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: 20220607
  • Expected Completion Date: 0
  • Actual Completion Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 01846754
  • Record Type: Research project
  • Source Agency: Transportation Research Board
  • Contract Numbers: Project 22-57
  • Files: TRB, RIP
  • Created Date: May 24 2022 1:13PM