Refer to: HSA-10/WZ-120
Mr. Matthew Mooney
NES Work Safe
2610 Sanford Avenue
Grandville, Michigan 49418
Dear Mr. Mooney:
Thank you for your letters of January 30 and February 6, 2002, requesting Federal Highway Administration (FHWA) acceptance of your company=s Type III Barricade as a crashworthy traffic control devices for use in work zones on the National Highway System (NHS). Accompanying your letter were drawings and a description of your barricades, comparing them to the generic Type III barricades distributed by FHWA. 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." On March 20, 2002, Mr. Nicholas Artimovich of my office contacted you via email with comments regarding the acceptability of your design. You responded to those comments with a drawing transmitted with your June 3, 2002, email message to Mr. Artimovich.
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 were those lightweight devices which could be self-certified by the vendor, Category II devices were other lightweight devices which needed individual crash testing, Category III devices were barriers and other fixed or massive devices also needing crash testing, and Category IV devices were trailer mounted lighted signs, arrow panels, etc. The second guidance memorandum was issued on August 28, 1998, and is titled AINFORMATION: 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:
The NES WorkSafe Type III barricade is comparable to the generic barricade accepted by FHWA Acceptance Letter WZ-54 on December 15, 2000. It consists of perforated square steel tube uprights, 12-gage wall thickness, measuring 1 3/4 inches on a side. The horizontal legs are 2 x 2 angles, 48 to 72 inches long, and have a 2 x 2 inch steel tube welded to the center to support the uprights. The 8-foot long plywood panels are bolted to the uprights with 3/8 inch x 3-inch-16 hex cap bolts and 1-½ inch flat washers. The lightweight warning lights are attached to the back of the uprights using ½ inch x 4 inches-16 zinc coated steel half moon light bolts with anti-theft cups. The bolts pass through the plywood rails also. The overall heights of the barricade are 60 inches to the top of the top rail and 68 inches to the top of the light.
Because this barricade is nearly identical to the successfully crash-tested barricade accepted by the FHWA it can be expected to perform in a similar manner. Therefore, the device described above and shown in the enclosed drawings for reference 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 FHWA letters of acceptance:
Carol H. Jacoby, P.E.
Director, Office of Safety Design