October 12, 2004
Refer to: HSA-10/WZ-180
Mr. Peter Speer
Bunzl Extrusion Tacoma Incorporated
3110 70th Avenue East
Tacoma, Washington 98424
Dear Mr. Speer:
Thank you for your letter of April 14, 2004, requesting Federal Highway Administration (FHWA) acceptance of a revision to your Parade-style Type I or II Barricades as a crashworthy traffic control device for use in work zones on the National Highway System (NHS). You requested that we find these barricades acceptable for use with this barricade 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 FHWA guidance on crash testing of work zone traffic control devices is contained in two memoranda. The first, dated July 25, 1997, titled "INFORMATION: Identifying Acceptable Highway Safety Features," established four categories of work zone devices: Category I devices are those lightweight devices which are to be self-certified by the vendor, Category II devices are other lightweight devices which need individual crash testing but with reduced instrumentation, Category III devices are barriers and other fixed or heavy devices also needing crash testing with normal instrumentation, and Category IV devices are trailer mounted lighted signs, arrow panels, etc., for which crash testing requirements have not yet been established. The second guidance memorandum was issued on August 28, 1998, and is titled "INFORMATION: Crash Tested Work Zone Traffic Control Devices." This later memorandum lists devices that are acceptable under Categories I, II, and III.
A brief description of the device follows:
Molded polyethylene or polypropylene "A-frame" legs measuring 40 to 44 inches high are molded to accommodate rectangular or "I-beam" shaped retroreflective barricade rails. A pair of legs can support a single barricade rail, or additional legs and rails can be connected in series to form a longer channelizing device.
|Component||Composition||Dimensions / notes||Weight|
|A-frame, Economy||Molded polypropylene||2 x 30 x 43 in., 1 or 2 rails||6.1 lb|
|A-frame, Sand-filled||Molded polyethylene||2 x 30 x 44 in., 1 rail||7.1 lb|
|A-frame, Molded Molded||polypropylene||2 x 28 x 40 in., 1 or 2 rails||7.4 lb|
|1 x 8 inch rails||Thermoplastic||¾ x 8 ¼ x 96 in.||5.25 lb|
|2 x 8 inch rails||Thermoplastic||1 ½ x 7 ¾ x 96 in.||5.37 lb|
|Barricade light||Empco-lite||Model 100 or 2000||3.3 lb|
Parade style barricades, using your sand-filled A-frame, were crash tested by TrafFix Devices and received the FHWA acceptance letter, WZ-24, dated December 28, 1999. The Bunzl thermoplastic rails may be considered equivalent to the I-shaped rails tested by TrafFix Devices (which weigh approximately 6.8 pounds). Therefore, your company's parade style barricades, using rails up to 8 feet long, 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 the FHWA letters of acceptance:
/Original Signed by/
John R. Baxter, P.E.
Director, Office of Safety Design
Office of Safety