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FHWA Home / Safety / Roadway Departure / Safety Eligibility Letter SS-178

Safety Eligibility Letter SS-178 - Safety

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U.S. Department of Transportation
Federal Highway Administration

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

February 6, 2013

In Reply Refer To:
HSST/SS-178

Mr. Ron Powell
Chief Executive Officer
Ground Connection, LLC
P.O. Box 5668
Pine Bluff, Arkansas  71611

Dear Mr. Powell:

This letter is in response to your request for the Federal Highway Administration (FHWA) to review a roadside safety system for eligibility for reimbursement under the Federal-aid highway program.

Name of system: Ground Connection Ground Screw Foundation
Type of system: Base for breakaway slip bases
Test Level: NCHRP Report 350 Test Level 3
Testing conducted by: Texas Transportation Institute
Date of request: October 24, 2012
Date initially acknowledged: November 13, 2012
Date of completed package: November 13, 2012

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

Based on a review of crash test results submitted by the manufacturer certifying the device described herein meets the crash test and evaluation criteria of the National Cooperative Highway Research Program (NCHRP) Report 350, the device is eligible for reimbursement under the Federal-aid highway program.  Eligibility for reimbursement under the Federal-aid highway program does not establish approval or endorsement by the FHWA for any particular purpose or use. 

The FHWA, the Department of Transportation, and the United States Government do not endorse products or services and the issuance of a reimbursement eligibility letter is not an endorsement of any product or service.

Requirements
To be found eligible for Federal-aid funding, roadside safety devices should meet the crash test and evaluation criteria contained in the NCHRP Report 350 or the American Association of State Highway and Transportation Officials' Manual for Assessing Safety Hardware (MASH).

Description
The device and supporting documentation are described in the attached form. Test 510602-GCL P1 consisted of a 4 foot × 8 foot sign mounted on a 2½ diameter schedule 80 pipe support on a Texas triangular slip base of ½-inch thick steel. The sign assembly was bolted to a triangular slip base plate welded to a single 3½-inch diameter, 42-inch long ground screw installed in standard soil. The generic slip base hardware had been crash tested under NCHRP Report 350 criteria on numerous occasions on rigid foundations. It is commonly referred to as the "omni-directional," "three-bolt," or "triangular" slip base. The Ground Screw Foundation is considered a modification to the foundation of the previously tested slip-base system. Because there was no change to the slip base mechanism itself, FHWA agreed that the system may be tested and evaluated under NCHRP Report 350 criteria.

Summary and Standard Provisions
Therefore, the system described and detailed in the attached form and drawing is eligible for reimbursement and may be installed under the range of conditions tested.

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

 

Sincerely yours,

/* Signature of Michael S. Griffith */

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

Enclosures

Page last modified on December 17, 2013.
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Federal Highway Administration | 1200 New Jersey Avenue, SE | Washington, DC 20590 | 202-366-4000