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FHWA Home / Safety / Roadway Departure / Eligibility Letter CC-34C

Safety Eligibility Letter CC-34C

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U.S. Department of Transportation
Federal Highway Administration

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


In Reply Refer To:

Mr. Barry Stephens
Trinity Highway Products, LLC
3617 Cincinnati Ave.
Rocklin, CA 95677

Dear Mr. Stephens:

This letter is in response to your June 13, 2014 request for the Federal Highway Administration (FHWA) to review a roadside safety device, hardware, or system for eligibility for reimbursement under the Federal-aid highway program. This FHWA letter of eligibility is assigned FHWA control number HSST/CC-34C and is valid until a subsequent letter is issued by FHWA that expressly references this device.

The following device is eligible, with details provided in the form which is attached as an integral part of this letter.

Scope of this Letter

To be found eligible for Federal-aid funding, new roadside safety devices should meet the crash test and evaluation criteria contained in the National Cooperative Highway Research Program (NCHRP) Report 350. However, the FHWA, the Department of Transportation, and the United States Government do not regulate the manufacture of roadside safety devices. Eligibility for reimbursement under the Federal-aid highway program does not establish approval, certification or endorsement of the device for any particular purpose or use. 

This letter is not a determination by the FHWA, the Department of Transportation, or the United States Government that a vehicle crash involving the device will result in any particular outcome, nor is it a guarantee of the in-service performance of this device. Proper manufacturing, installation, and maintenance are required in order for this device to function as tested.

This finding of eligibility is limited to the crashworthiness of the system and does not cover other structural features, nor conformity with the Manual on Uniform Traffic Control Devices.

Eligibility for Reimbursement

FHWA previously issued an eligibility letter for the roadside safety system described in your pending request. Your pending request now identifies a modification to that roadside safety system.

The original roadside safety device information is provided here:

Name of system: MPS 350 truck-mounted attenuator (TMA)
Type of system: Crash Cushion
Date of original request: December 6, 2002
Date of original FHWA eligibility letter: March 5, 2003
FHWA Control number: HSA-10/CC34B

The pending modification(s) consists of the following changes:

  1. Framework will be available in either painted or galvanized finish. The winch attachment brackets are changed to place the winch in a level, horizontal mounting position. This modification has no effect to the load bearing structural elements or to the previous as-tested performance.

  2. Provide lighting systems in either 12 or 24 volt, and incandescent or LED type lights. This modification has no effect to the load bearing structural elements of to the previous as-tested performance.

  3. Add winch controls including both upper & lower limit switches, attitude tilt sensor, low voltage shut off and audible alarm. This modification is to improve winch performance has no effect to the previous as-tested impact performance.

  4. Trapezoidal shaped formed plastic impact face cover with multiple striping patterns to meet specific state standards. The light weight and low strength plastic cover shape modification will have no effect to the previous as-tested performance.

  5. Informative decal package. This modification has no effect to the previous as-tested performance.

FHWA concurs with the recommendation of the accredited crash testing laboratory as stated within the attached form.

Full Description of the Eligible Device

The device and supporting documentation, including reports of the crash tests or other testing done, videos of any crash testing, and/or drawings of the device, are described in the attached form.


If a manufacturer makes any modification to any of their roadside safety hardware that has an existing eligibility letter from FHWA, the manufacturer must notify FHWA of such modification with a request for continued eligibility for reimbursement. The notice of all modifications to a device must be accompanied by:

FHWA's determination of continued eligibility for the modified hardware will be based on whether the modified hardware will continue to meet the relevant crash test criteria.

You are expected to supply potential users with sufficient information on design, installation and maintenance requirements to ensure proper performance.

You are expected to certify to potential users that the hardware furnished has the same chemistry, mechanical properties, and geometry as that submitted for review, and that it will meet the test and evaluation criteria of the NCHRP Report 350.

Issuance of this letter does not convey property rights of any sort or any exclusive privilege. This letter is based on the premise that information and reports submitted by you are accurate and correct. We reserve the right to modify or revoke this letter if: (1) there are any inaccuracies in the information submitted in support of your request for this letter, (2) the qualification testing was flawed, (3) in-service performance or other information reveals safety problems, (4) the system is significantly different from the version that was crash tested, or (5) any other information indicates that the letter was issued in error or otherwise does not reflect full and complete information about the crashworthiness of the system.

Standard Provisions

Sincerely yours,

Signature of Michael S. Griffith

Michael S. Griffith
Director, Office of Safety Technologies
Office of Safety


Page last modified on September 28, 2016
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