March 18, 2004
Refer to: HSA-10/WZ-175
Ms. Bonnie Ruggless, President
1547 Michigan Street
Des Moines, Iowa 50314-3532
Dear Ms. Ruggless:
Thank you for your letter of March 17, 2004, requesting Federal Highway Administration (FHWA) acceptance of your company's Type II barricades as crashworthy traffic control devices for use in work zones on the National Highway System (NHS). Accompanying your letter were drawings of your barricade. You requested that we find these 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 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.
Your request is for the FHWA acceptance of Type II barricades which, with the exception of the width, are of the same materials and dimensions as the Manual on Uniform Traffic Control Devices (MUTCD) Type II barricades which were crash tested by the Bent Manufacturing Company and found acceptable in the FHWA Acceptance Letter WZ-06 of November 23, 1998, and distributed by the FHWA as generic models in the FHWA Acceptance Letter WZ-54 of September 15, 2000. Your barricades will be 24 inches wide whereas the crash-tested barricades were 36 inches wide.
Because the materials you propose to use are identical to those in the crash tested Type II barricade we concur that the Type II barricade detailed in the enclosures, can be expected to perform in a similar manner to the tested barricade. Therefore, it is acceptable for use on the NHS under the range of conditions the Type II barricade was 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