U.S. Department of Transportation
Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC 20590

Skip to content


eSubscribe Envelope

FHWA Home / Safety / Roadway Departure / Eligibility Letter CC-35L

Safety Eligibility Letter CC-35L

Download Version
PDF [1.41 MB]

DOT logo
U.S. Department of Transportation
Federal Highway Administration

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

December 18, 2015

In Reply Refer To:

Mr. Bret Eckert P.E.
Engineering Applications Manager
Trinity Highway Products
3617 Cincinnati Avenue
Rocklin, CA 95677

Dear Mr. Eckert:

This letter is in response to your August 1, 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 CC-35L and is valid until a subsequent letter is issued by FHWA that expressly references this device.

The following devices are 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, modified 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: QuadGuard
Type of system: Crash Cushion
Date of original request: February 20, 1996
Date of original FHWA eligibility letter:

June 21, 1996

FHWA Control number: CC-35

The modification(s) to the QuadGuard covered by this letter are:

  1. Modified the QuadGuard Product Manual to the current Trinity Highway format. In addition, the recommended anchor torque value for asphalt was improved from <10 ft-lbs to 10 ft-lbs.
  2. Modified the dimension format on the QuadGuard cartridge box from decimal to fractional and changed the molded in company name. Adjusted the tolerances that are consistent with typical blow molding process capabilities for items this size. Improved identification of the cartridge type on the outside of the box from self-adhesive decal to painted on cartridge type.
  3. Improved the diaphragm lower reinforcements horizontal fillet weld by increasing total weld length on each surface from 17" to 18".
  4. Improved the hinge pivot attachment on the diaphragm hinge plates.
  5. Improved the method of ensuring consistent preloading of the fender panel rear tension springs from compressing 1/16" to 1/8", to tightening the nut on mushroom washer bolt until it reaches end of threads. This method eliminates nut loosening and maintains consistent fender panel end gap. The protective coating on the fender panel springs was improved from power coated to mechanically galvanized. The spring rate will be unchanged yielding superior corrosion protection.
  6. Modified the channel used for QuadGuard transition bracing by adding a 1" × 11/16" slot for galvanizing drainage.
  7. Modified the steel nose on QuadGuard II by adding a small ink "W" letter on the side below the attachment holes for identification of wide nose components.

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 George E. Rice, Jr.

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


Page last modified on April 20, 2016
Safe Roads for a Safer Future - Investment in roadway safety saves lives
Federal Highway Administration | 1200 New Jersey Avenue, SE | Washington, DC 20590 | 202-366-4000