Refer to: HSA-10/WZ-165
Mr. John Lund, Chief Engineer
10706 West Grand Avenue
Franklin Park, Illinois 60131
Dear Mr. Lund:
Thank you for your letter of August 15, 2003, requesting Federal Highway Administration (FHWA) acceptance of your company's Type I and Type II steel-legged barricades with waffleboard panels as crashworthy traffic control devices for use in work zones on the National Highway System (NHS). Accompanying your letter were detailed drawings and material specifications of the barricades. You requested that we find them 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.
SteelCade Type I Barricades
|97-03-001||12"||8"||EGR Sheeting||None||8.7 kg||10.2 kg|
|97-03-001-01||12"||8"||Hi-Intensity Sheeting||None||8.7 kg||10.2 kg|
|97-03-001-02||12"||8"||SEG Sheeting||None||8.7 kg||10.2 kg|
|97-03-001-11||12"||8"||Prismatic w/arrow||None||8.7 kg||10.2 kg|
SteelCade Type II Barricades
|97-003-002||8"||8"||EGR Sheeting||EGR Sheeting||8.2 kg||9.7 kg|
|97-03-002-01||8"||8"||Hi-Intensity Sheeting||Hi-Intensity Sheeting||8.2 kg||9.7 kg|
SteelCade Type II Barrel Eliminators
|97-03-002-02||12"||8"||Hi-Intensity Sheeting||Hi-Intensity Sheeting||8.7 kg||10.2 kg|
|97-03-003-01||12"||8"||EGR Sheeting||EGR Sheeting||8.7 kg||10.2 kg|
|97-03-003-01-11||12"||8"||Prismatic w/arrow||EGR Sheeting||8.7 kg||10.2 kg|
The larger (12") panels are 610 mm x 308 mm x 19.05 mm thick. The thickness steps down to 11.43 mm at each end. They are of a waffleboard configuration, with the panel face being 3.00 mm and the ribs being 2.50 to 3.00 mm thick. The mass of the larger panels is 0.80 kg maximum. The smaller (8") panels are similar with dimensions of 610 mm x 156 mm and a mass of 0.55 kg maximum. All panels are made from copolymer polypropylene resin.
The 1150 mm long legs are of angle iron configuration, 31.75 mm x 31.75 mm x 12 gage steel. They are formed from hot rolled steel sheet or strip stock, AISI Grade 1015 to 1020. Each leg has a mass of 1.45 kg maximum. Panels are attached to the legs in the factory using 6.35 mm diameter steel/aluminum rivets. The steel center shank is 3.80 mm which is only slightly less than the 4.15 mm root diameter of the threads of the ¼-20 bolts used in the original crash tested generic barricade (FHWA Letter WZ-6 to Bent Manufacturing, Generic version in WZ-85 dated November 15, 2001.) The legs are joined at the pivot point with 12.7 mm x 25 mm long steel bolts.
Full-scale automobile testing was conducted on all-plastic barricades using your company's plastic panels. These were found acceptable in our letters to Dicke Tool Company (WZ-17 dated July 20, 1999) and to The Cortina Companies (WZ-47 dated July 19, 2000.) Type I and II Generic barricades, which your barricades conform to, are detailed in our Memorandum WZ-85 dated November 15, 2001.
Because the barricades described above and in the enclosed drawings have either been successfully crash tested or conform to FHWA's generic barricade specifications, they will be acceptable for use on the NHS under the range of conditions that the generic barricades were tested, when proposed by a State. These barricades may be field assembled from the component parts supplied by Cortina. When a contractor attaches a lightweight warning light to the top of any of these barricades, the hardware shall be replaced with the tamperproof hardware provided by the light manufacturer.
Please note the following standard provisions that apply to FHWA letters of acceptance:
John R. Baxter, P.E.
Director, Office of Safety Design
Office of Safety