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FHWA Home / Safety / Roadway Departure / Safety Eligibility Letter

Safety Eligibility Letter B-42A

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U.S. Department of Transportation
Federal Highway Administration

1200 New Jersey Ave. S.E.
Washington, D.C. 20590

February 20, 2009

In Reply Refer To: HSSD/B-42A

Mr. Michael Budd
Rockingham Precast
P.O. Box 1347
Harrisonburg, VA 22801

Dear Mr. Budd:

This letter is a follow-on response to your request for the Federal Highway Administration (FHWA) acceptance of a roadside safety device for use on the National Highway System (NHS).

Name of system: 18-Foot T-LOC F-Shaped Portable Concrete Barrier
Type of system: Temporary concrete barrier
Test Level: NCHRP Report 350 Test Level-3
Testing conducted by: N/A
Date of request: March 17, 2008
Initial response by email sent March 18, 2008

You subsequently requested that we formally find this device acceptable for use on the NHS under the provisions of National Cooperative Highway Research Program (NCHRP) Report 350 “Recommended Procedures for the Safety Performance Evaluation of Highway Features.”

Requirements
Roadside safety devices should meet the guidelines contained in the NCHRP Report 350, "Recommended Procedures for the Safety Performance Evaluation of Highway Features". FHWA Memorandum “ACTION: Identifying Acceptable Highway Safety Features” of July 25, 1997, provides further guidance on crash testing requirements of longitudinal barriers.

Description
The Rockingham Precast T-LOC barrier was accepted on October 20, 1997, in our Acceptance Letter B-42 to you. The barrier tested was composed of 12-foot long segments, and your present request is for formal acceptance of 18-foot or longer segments.

Findings
We concur in your request that the T-LOC concrete barrier segments that have been successfully crash tested to NCHRP Report 350 Test Level 3 conditions at a segment length of 12 feet will be considered acceptable for use on the NHS when the segments are manufactured to a length of 18 feet or more, assuming all other factors such as concrete strength, reinforcing details, and end connections are identical to the tested version.

Please note the following standard provisions that apply to the FHWA letters of acceptance:

 

Sincerely yours,

Signature of David A. Nicol
David A. Nicol
Director, Office of Safety Design
Office of Safety

Page last modified on June 24, 2011.
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