MASH TL-4 Concrete Median Barrier with Fence Mounted on Top (613131/Task Order DN)

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Final Report Link: MASH TL-4 Concrete Median Barrier with Fence Mounted on Top


TTI Research Supervisor:

Chiara Silvestri Dobrovolny, Ph.D.

Associate Research Scientist

Texas A&M Transportation Institute

TAMU 3135

College Station, Texas 77843-

3135 (979) 317-2687

[email protected]

Pooled Fund Technical Representative:

Derwood C. Sheppard, Jr., P.E., M.Eng.

Standard Plans Publication Engineer

FDOT Road Design Office

Florida Department of Transportation

605 Suwannee Street

Tallahassee, FL 32399-0450

(850) 414-4334

[email protected]


Concrete median barriers (CMB) are used by Departments of Transportation (DOTs) as both permanent and temporary barriers for providing separation of traffic. Typically, the crashworthiness of these barriers is tested and evaluated through full-scale crash testing conducted per current roadside safety device standards. Occasionally, DOTs need to mount chain link fences on top of these barriers to serve different purposes. In other cases, due to space restrictions, signs or light poles are placed on top of such barriers. When DOTs mount these objects on top of barriers the crashworthiness of the modified system will need to be evaluated. The purpose of this research was to investigate the crashworthiness of a 36-inch-tall concrete single slope median barrier with chain link fence mounted on top under MASH evaluation criteria. The structural capacity and the occupant risk factors of the proposed barrier system was evaluated with respect to MASH Test Level 4 (TL-4) criteria through full-scale crash testing. The CMB with fence mounted on top met the performance criteria for MASH Test 4-11 for longitudinal barriers, but failed MASH Test 4-12.