Federal Highway Administration
400 Seventh St., S.W.
Washington, D.C. 20590
March 22, 2005
Refer to: HSA-10/WZ-197
Mr. Jeffery M. Siadik
Vice President of Operations
Traffic Safety Service Corporation
601 Hadley Road
P.O. Box 615
South Plainfield, New Jersey 07080
Dear Mr. Siadik:
Thank you for your letter of December 2, 2004, requesting Federal Highway Administration (FHWA) acceptance of your company's 48-inch wide Type III plastic barricades as crashworthy traffic control devices for use in work zones on the National Highway System (NHS). 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." Downriver Plastics is the manufacturer of the framing elements that were used in the Type III Barricade that was crash tested and found acceptable in the FHWA acceptance letter WZ-104 on January 11, 2002. The vendor who sponsored that test, PMG Lobo Limited, is no longer in business manufacturing this barricade.
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.
The type III barricade tested by the original vendor was a compact lightweight device featuring blow molded high density polyethylene upper and lower supports and hollow extruded plastic panels. The upper and lower supports are joined together with a simple slip-fit connection. The 210 mm high by 1219 mm long barricade panels are made from a specially formulated polyolefin plastic and surfaced with reflective sheeting. Each of the three panels is secured to the uprights with four 9.5 mm diameter by 76.2 mm long ASTM A307 hex bolts and nuts with plain washers front and back. The mass of each test article was 13.4 kg. Each was placed on a flat, clean, and dry asphalt surface with three 15.9 kg sandbags placed on the lower support legs of each barricade for ballast. No flags, lights, or signs were mounted on the test articles.
As you are now obtaining the "blow molded high density polyethylene upper and lower supports" directly from the manufacturer, you have requested acceptance of this barricade using flat polyethylene panels, 3/16 inch thick, in lieu of the hollow core panels crash tested by the original vendor. The weight of the original barricades tested by the previous vendor was 13.4 kg (29.5 pounds.) With the substitution of the 3/16 poly panels, which weigh 0.9 kg (2 pounds) each, the barricade will weigh 9 kg (20 pounds). As we have allowed the substitution of such panels with some other Type III barricades, we agree with your assertion that the revised barricade will perform in an acceptable manner.
Full-scale automobile testing was conducted. Two stand-alone examples of the device were tested in tandem, one head-on and the next placed six meters downstream turned at 90 degrees, as called for in our guidance memoranda. When struck the upper portions of the barricades came out of the base sections and were knocked ahead of the vehicle. Damage was limited to dents and scrapes in the hood. There did not appear to be any potential for passenger compartment intrusion. The results of the testing met the FHWA requirements.
Your modification to the successfully tested barricade only affects the horizontal rails. Provided the rails are connected to the barricade frame in substantially the same manner as the tested barricade was fabricated, your Type III Barricade described above and shown in the enclosed drawing for reference will be acceptable for use on the NHS under the range of conditions the original 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
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