March 4, 2003

Refer to: HSA-10/WZ-145

Mr. William Jamieson
PMG Ltd.
P.O. Box 247
Novelty, Ohio  44072

Dear Mr. Jamieson:

This is in response to your letter of December 3, 2002, requesting Federal Highway Administration (FHWA) acceptance of your company's Type I and II barricades, Vertical Panel, and Universal A-Barriers as crashworthy traffic control devices for use in work zones on the National Highway System (NHS). Accompanying your letter was product literature illustrating the various devices. 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” without additional crash testing.


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 “INFORMATION: Crash Tested Work Zone Traffic Control Devices.” This later memorandum lists devices that are acceptable under Categories I, II, and III.

PMG Sentinel Type I and Type II Foldable “A”-Frame Traffic Control Devices
Your request was for two products, both of which can serve as either a Type I or Type II device. Both feature recessed horizontal panels to accommodate reflective sheeting, and are distinguished by the size of the recessed panel, either 12 inches or 8 inches high.

PMG Part Numbers:

12” Panel:
112BC for Type I, or 212BC for Type II
12.25” x 24.25” top panel, 8.25 x 24.25” bottom panel

8” Panel:           
108BC for Type I, or 208BC for Type II
8.25” x 24.25” panel top and bottom

PMG Sentinel Type I Vertical Panel Foldable “A”-Frame Traffic Control Devices
This request was for two products, both of which are Type I vertical panels, distinguished by overall height. You call them Sentinel Jr. and the Sentinel Mini.

PMG Part Numbers:
112BJ, 12.125” x 24.125” panels, overall height of 41” (Junior)
112BM, 12.125” x 24.125” panels, overall height of 30.5” (Mini)


The PMG Limited high-density polyethylene plastic vertical panels and Type I & II barricades are similar in size, weight, and materials to other crashworthy vertical panels and barricades. They can be expected to perform as well as the generic steel leg barricades found acceptable in FHWA Acceptance Letter WZ-85 dated November 15, 2001.  Therefore, the devices described in the various requests above and detailed in the enclosed drawings are acceptable for use on the NHS under the range of conditions that the generic barricades were tested, when proposed by a State.  Note that this acceptance is for the barricades and vertical panels, plus reflective sheeting (and properly located ballast, if needed), only.  If these are to be used with warning lights they should be crash tested with the type of light(s) they will be used with.

You also requested acceptance for the PMG Sentinel Types I, II, and III Universal A-Barrier Traffic Control Devices.  This barricade system is unlike any generic barricade system that has been crash tested.  Therefore we must recommend that these barricades be crash tested before we can take action.


The results of the testing met the FHWA requirements and, therefore, the devices described in the various requests above and detailed in the enclosed drawings 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:

Sincerely yours,

Michael S. Griffith   

Acting Director, Office of Safety Design

Office of Safety