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U.S. Department of Transportation

Federal Highway Administration

1200 New Jersey Ave. S.E.
Washington, D.C. 20590

March 19, 2009

In reply to: HSSD/WZ-277

Mr. Marc Christensen
Off the Wall Products, LLC
P.O. Box 1461
Salt Lake City, UT 84110

Dear Mr. Christensen:

In your letter of January 29 you requested the Federal Highway Administration (FHWA) acceptance of the modified and re-designed Multi Barrier Model MB 42 x 72 JSS longitudinal channelizing device as a crashworthy traffic control devices for use in work zones on the National Highway System (NHS). Accompanying your letter was the FHWA Office of Safety Design form, a drawing of the device, and a detailed description of previous testing you completed on a similar longitudinal channelizing device (WZ-255). The drawing and detailed description are enclosed with the acceptance form for the re-designed Multi Barrier Model MB 42 x 72 JSS longitudinal channelizing device. The re-designed device is intended for use with no more than 41 liters (10.8 gallons) of water in each module as ballast. You requested that we find this device acceptable for use on the NHS under the provisions of the National Cooperative Highway Research Program Report 350, "Recommended Procedures for the Safety Performance Evaluation of Highway Features”.

This letter is the acknowledgement of the FHWA’s acceptance of your requests. Longitudinal channelizers should not be described as "barriers" because they do not meet crashworthiness requirements for redirection. A suggested example for labeling each unit or module to indicate limitations of use are enclosed. The original completed forms have been modified by the addition of the FHWA acceptance letter number and the date of our review. The form will be posted on our Web site in the near future.

Sincerely yours,

Signature of David A. Nicol, P.E.

David A. Nicol, P.E.
Director, Office of Safety Design
Office of Safety


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