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U.S. Department of Transportation

Federal Highway Administration

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

May 8, 2008

In Reply Refer To: HSSD/WZ-270

Mr. Matthew C. Nobe
Traffic Products Manager
Grimco, Inc.
1585 Fencorp Drive
Fenton, MO 63026

Dear Mr. Nobe:

Thank you for your correspondence requesting the Federal Highway Administration’s (FHWA) acceptance of Max-Metal 3 mm and 4 mm thick sign substrate. Accompanying your letter were product specification certificates and samples of the substrate. You requested acceptance of Max-Metal as a sign substrate for use with accepted sign stands on the National Highway System (NHS) under the provisions of the National Cooperative Highway Research Program (NCHRP) Report 350 “Recommended Procedures for the Safety Performance Evaluation of Highway Features.”

Upon request, you provided samples of the Max-Metal sign substrate to the FHWA and a copy of the product specifications. The Max-Metal test data are enclosed. The Max-Metal sign substrate is a brand name of aluminum laminate material. The material properties of the 3 mm and 4 mm Max-Metal substrate are nearly identical and considered to be equivalent to other previously accepted 2 mm, 3 mm, and 4 mm aluminum laminate sign substrates. Our records indicate that 3 mm and 4 mm aluminum laminate signs have been successfully crash tested on portable stands made by a number of manufacturers and are limited to use on the tested and accepted stands. Therefore, the FHWA accepts the use of Max-Metal 3 mm and 4 mm aluminum laminate sign substrates for use on the NHS under the range of conditions that equivalent materials have been tested and accepted, when proposed by a State.

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

Sincerely yours,

David A. Nicol

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


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