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The National Academies

NCHRP 22-20(02) [Completed]

Design Guidelines for TL-3 through TL-5 Roadside Barrier Systems Placed on Mechanically Stabilized Earth (MSE) Retaining Walls

  Project Data
Funds: $610,000
Research Agency: Texas A&M Transportation Institute
Principal Investigator: Roger Bligh
Effective Date: 5/14/2010
Completion Date: 5/31/2017

The objective of this research was to develop, in a format suitable for consideration by AASHTO, recommended guidelines for designing roadside barrier systems placed on MSE retaining structures to resist vehicular impact loadings varying from passenger vehicles to heavy trucks. To extend the work done under Project 22-20, this project consisted of engineering analyses, computer modeling, and bogie testing for Test Levels 3 through 5 and included full-scale crash testing of a tractor-van trailer (TL-5) into a barrier placed atop an MSE retaining wall. The guidelines address Test Levels 3 through 5. Specific considerations included defining appropriate design loads, developing procedures for sizing the traffic barrier foundation, and designing the MSE wall when traffic barriers are required.

STATUS:  Research completed; publication of final report is pending.

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