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FHWA Home / Safety / Roadway Departure / Safety Eligibility Letter

Safety Eligibility Letter WZ - 193

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U.S. Department of Transportation
Federal Highway Administration
400 Seventh St., S.W.
Washington, D.C. 20590

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December 6, 2005

In Reply Refer To: HSA/ WZ-193 Amendment #1

Mr. Peter Speer
Davidson Traffic Control Products
Filtrona Extrusion, Inc.
3110 70th Avenue East
Tacoma, Washington 98424

Dear Mr. Speer:

Thank you for your email of September 23, 2005, requesting the Federal Highway Administration (FHWA) acceptance of a modification to your company's FG300 Curb System as a crashworthy traffic control device for use in work zones on the National Highway System (NHS). The original FG300 Curb System was made of two basic parts, the curb unit, and a "base" unit that supported a road tube. Your proposal is to combine the two parts into one, which would simplify installation. You requested that we find the modified 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."

The principal reason for conducting crash testing of curb channelizer units is to ensure that the linked units do not separate upon impact. By combining the two primary units into one you reduce the likelihood that parts will separate. We concur that this would improve the safety performance of the FG300 curb system. We understand that the number of anchors will be reduced because you no longer have two components that need to be anchored separately.

The devices described in the original acceptance letter, WZ-193, dated November 2, 2004, as modified above and detailed in the enclosed drawings are acceptable for use on the NHS under the range of conditions tested, when proposed by a State.

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

Sincerely yours,

/original signed by/

John R. Baxter, P.E.
Director, Office of Safety Design
Office of Safety

Enclosures

Page last modified on June 24, 2011.
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