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U.S. Department of Transportation

Federal Highway Administration

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

July 17, 2007

In Reply Refer To: HSSD/WZ-167A

Mr. Bill Fisher
Ply-Glo Safety Devices
RR #2
Crossfield AB T0M 0S0 CANADA

Dear Mr. Fisher:

Thank you for your correspondence, received on May 8, 2007, requesting Federal Highway Administration (FHWA) acceptance of your company's new flasher design for illuminated road tubes as crashworthy traffic control devices for use in work zones on the National Highway System (NHS). Accompanying your letter were dimensioned drawings of the new flasher and a sample flasher unit. You requested that we update your acceptance letter to incorporate the new design of your flasher unit device for delineators (or road tubes) and find this combination of devices 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 previous design submitted by Ply-Glo was accepted by FHWA in our letter WZ-167 in 2003. The Ply-Glo device is a low-density polyethylene road tube delineator mounted on a detachable rubber base. A light source is mounted in the tube such that the light shining up through the tube illuminates it from within and increases nighttime visibility. This previous design was such that the flasher device was secured inside the bottom of the delineator (road tube). The new design, as shown in the enclosed drawings, securely holds the light source into the top of the delineator. The light source weighs 1/2 of a pound. The new design is equivalent to the previous design and is acceptable for use on the NHS when proposed by a State.

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

Sincerely yours,

George E. Rice

George E. Rice, Jr.
Acting Director, Office of Safety Design
Office of Safety


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