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                Safety Eligibility Letter WZ-106A
  
  **Hardware Type:**
            Work Zone Devices
                          **Code:**
            WZ-106A
                          **Date:**
            11/21/2006
                          **Testing Criteria:**
            NCHRP 350
                          **Manufacturer:**
            Yodock
                          **Device Description:**
            Energy Displacement cell channelizer
                          **View PDF:**
            wz106a.pdf (193.68 KB)
    
    
Skip to contentSkip to contentUnited States Department of Transportation - Federal Highway AdministrationDOT logo
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
	President
	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:
Our 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-serviceperformance 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 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-106A 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 Yodock Wall plastic safety shape units are patented  and considered "proprietary." The use of proprietary work zone traffic control devices in  Federal-aid projects is generally of a temporary nature. They are selected by the contractor for use  as needed and removed upon completion of the project. Under such conditions they can be presumed to meet requirement  "a" given below for the use of proprietary products on Federal-aid  projects. On the other hand, if  proprietary devices are specified 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 existing highway  facilities or that no equally suitable alternative exists or: (c) they must be  used for research or for a distinctive types 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.Sincerely yours,

**/original signed by /**
John R. Baxter, P.E.
Director, Office of Safety Design
Office of Safety

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