Skip to contentUnited States Department of Transportation - Federal Highway Administration FHWA HomeFeedback

June 1, 2007


In Reply Refer To: HSSD/WZ-258


Mr. Bill Korman
Korman Signs, Incorporated
3029 Lincoln Avenue
Richmond, VA  23228

Dear Mr. Korman:

Thank you for your August 21, 2006, letter requesting the Federal Highway Administration's (FHWA) acceptance of your company's Model SS548DIUC ground mounted sign stand as a crashworthy traffic control device for use in work zones on the National Highway System (NHS).  Accompanying your letter was the FHWA Office of Safety Design form that included a drawing and a detailed description of the modifications made to create the SS548DIUC design from previously FHWA accepted sign stand designs recorded in the FHWA acceptance letters WZ-21, WZ-29, and WZ-100 Amendment #1.  The Model SS548DIUC drawing and detailed description are enclosed with the acceptance form.  We agree that further crash testing is not necessary for the Model SS548DIUC ground mounted sign due to the equivalent design of your company's previously accepted sign stands.  You requested that we find this sign stand 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".

This letter is the acknowledgement of the FHWA's acceptance of your request.  The original completed form has been modified by the addition of the FHWA acceptance letter number and the date of our review, along with minor editorial changes.  The form will be posted on our

Web site in the near future.

Please note the following standard provisions that apply to the FHWA letters of acceptance:

·        This acceptance is limited to the crashworthiness characteristics of the devices and does not cover their structural features, nor conformity with the Manual on Uniform Traffic Control Devices.

·        Any changes that may adversely influence the crashworthiness of the device will require a new acceptance letter.

·        Should the FHWA discover that the qualification testing was flawed, that in-service performance reveals unacceptable safety problems, or that the device being marketed is significantly different from the version that was crash tested, it reserves the right to modify or revoke its acceptance.

·        You will be expected to supply potential users with sufficient information on design and installation requirements to ensure proper performance.

·        You will be expected to certify to potential users that the hardware furnished has essentially the same chemistry, mechanical properties, and geometry as that submitted for acceptance, and that they will meet the crashworthiness requirements of the FHWA and the NCHRP Report 350.

·        To prevent misunderstanding by others, this letter of acceptance, designated as number

WZ-258, shall not be reproduced except in full.  This letter, and the test documentation upon which this letter is based, is public information.  All such letters and documentation may be reviewed at our office upon request.

·        The Model SS548DIUC is a patented product and considered proprietary.   If proprietary devices are specified by a highway agency for use on Federal-aid projects, except exempt, non-NHS projects, they: (a) must be supplied through competitive bidding with equally suitable unpatented items; (b) the highway agency must certify that they are essential for synchronization with the existing highway facilities or that no equally suitable alternative exists; or (c) they must be used for research or for a distinctive type of construction on relatively short sections of road for experimental purposes.  Our regulations concerning proprietary products are contained in Title 23, Code of Federal Regulations, Section 635.411.

·        This acceptance letter shall not be construed as authorization or consent by the FHWA to use, manufacture, or sell any patented device for which the applicant is not the patent holder.  The acceptance letter is limited to the crashworthiness characteristics of the candidate device, and the FHWA is neither prepared nor required to become involved in issues concerning patent law.  Patent issues, if any, are to be resolved by the applicant.

Sincerely yours,

George E. Rice

George E. Rice, Jr.

Acting Director, Office of Safety Design

Office of Safety


document 1  document 2  document 3  document 4  document 5  document 6  document 7  graphic 1