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U.S. Department of Transportation

Federal Highway Administration

400 Seventh St., S.W.
Washington, D.C. 20590

November 21, 2006

Refer to: HSA-10/WZ-106A

Mr. Leo J. Yodock, III
The Yodock Wall Co., Inc.
1000 Market Street, Suite 14
Bloomsburg, PA 17815

Dear Mr. Yodock :

This letter modifies the previous letter issued February 6, 2002, of the Federal Highway Administration (FHWA) acceptance of your company's Energy Dispersement Cell Channelizer (EDCC) as a crashworthy traffic control device for use in work zones on the National Highway System (NHS). You requested that we find this device acceptable when used with or without water as ballast as a Test Level 2 (TL-2) device 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."

Submitted with your request is a reference e-mail dated July 26, 2007, from Dr. Dean Alberson, Research Engineer at Texas Transportation Institute. This email states Dr. Alberson's concurrence that some ballast would be the appropriate critical impact test. The FHWA is in agreement that crash testing and evaluation with some ballast is a worst case scenario. Therefore, the FHWA considers the subject product as described and approved by our prior letter, coded WZ-106, also acceptable without water ballast for use on the NHS when proposed by a State. In addition, the Model 2001m EDCC, which is 812 mm (32 inches) tall, will also be acceptable subject to the same conditions and restrictions as the crash-tested Model 2001 EDCC, with or without water ballast.

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

Sincerely yours,

/original signed by /

John R. Baxter, P.E.
Director, Office of Safety Design
Office of Safety

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