U.S. Department of Transportation
Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC 20590
|400 Seventh St., S.W.|
Washington, D.C. 20590
Refer To: HSA-10/WZ-97
Ms. Theresa Steffler
Highway Safety Products
Radiator Specialty Company
P.O. Box 34689
Charlotte, NC 28234-4689
Dear Ms. Steffler:
Thank you for your letter of August 17 requesting Federal Highway Administration (FHWA) acceptance of a number portable sign stands for roll-up signs. Your company wishes to market these stands as crashworthy traffic control devices for use in work zones on the National Highway System (NHS) under your own company name. You referenced FHWA Acceptance Letters from the manufacturer of the stands that document the crashworthiness of the devices. You requested that we find those 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.”
Your request was for a letter that specified the Radiator Specialty Products part numbers only. Because the tests were conducted for Dickie Tool Company, and all of the documentation we have on file references the crash tested devices to Dickie Tool part numbers, we are not able to comply with your request without specific reference to the Dickie Tool devices and crash tests. Therefore we have included these references so that potential users may review these letters and drawings to ensure that the stands will meet their needs.
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 latest memorandum lists devices that are acceptable under Categories I, II, and III.
Following is a description of the devices with Radiator Specialty Products part numbers, and reference to the FHWA Acceptance Letter they are listed in:
1. Radiator Part No. JS4000
Accepted as DF4000 Stand in FHWA Acceptance letter WZ-50 dated October 19, 2000.
A heavy duty, double torsion spring mounted sign support with a 1220 x 1220 mm sign mounted at a height of 305 mm from the ground and with three wood-staffed flags mounted at a height of 2305 mm. This stand supported a RUNR48 non-reflective vinyl roll‑up sign. Tested head-on and at 90 degrees.
2. Radiator Part No. JST50
Accepted as T50 Tripod Stand in FHWA Acceptance Letter WZ-50 dated October 19, 2000.
Short Top Stand. A tripod with the tops of the legs shortened, mounted portable sign support with a 1220 x 1220 mm sign mounted at a height of 330 mm and without flags. This stand supported a RUNR48 non-reflective vinyl roll‑up sign.
3. Radiator Part No. JS4700
Accepted as DF-4700TX stand in FHWA Acceptance Letter 25 dated May 24, 2000.
A heavy-duty torsion spring mounted sign support with a 1218 mm square vinyl sign mounted at 2134 mm above the pavement with three wood-staffed flags mounted at 3835 mm. The two-part aluminum mast extends to the top of the sign.
4. Radiator Part No. JL1000
Accepted as DL1003W, QLV-W, or MSRIGID-30 stand in FHWA Acceptance Letter 17 dated July 20, 1999
A rigid mounted portable sign support with a 1219 mm square vinyl sign mounted at a height of 356 mm and three wood-staffed flags mounted at 2076 mm.
5.Radiator Part No. JS3000
Accepted as DF3000WQ stand in FHWA Acceptance Letter 17 dated July 20, 1999.
A double-torsion, spring mounted sign support with a 1216 mm x 1219 mm vinyl sign mounted at 368 mm and with two fiberglass-staffed flags at 2083 mm.
Details of the sign stands are in the attachments to the various letters referenced above. These may be found on the FHWA web site at:
Testing and Findings
Full-scale automobile testing was conducted on these portable sign stands and was documented in the above-mentioned acceptance letters. During the tests the most extensive damage was cracking of the windshield. However, there was no occupant compartment intrusion or deformation observed, nor did any test article debris show potential for penetrating the occupant compartment. The results of this testing met the FHWA requirements and, therefore, the devices listed above and detailed in the referenced Acceptance Letters are acceptable for use on the NHS under the range of conditions tested as NCHRP Report 350 Test Level 3 devices (except as noted), when proposed by a State.
Please note the following standard provisions which apply to FHWA letters of acceptance:
Frederick G. Wright, Jr.
Program Manager, Safety