1200 New Jersey Ave., SE

 Washington, D.C. 20590

July 3, 2013

FHWA:HSST:NArtimovich:sf:x61331:6/18/13

File: s://directory folder/HSST/SS179_CenterlineSupply.docx

cc: HSST: NArtimovich

In Reply Refer To:

HSST/SS-179

Mr. Gregory R. Brinkmeyer, P.E.

Hori-Zone Concepts LLC

14417 Chandler Road

Taylor, Texas 76574

Dear Mr. Brinkmeyer,

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: Centerline Supply Triangular Slipbase Locking Sign Collar Assembly

Type of system: Breakaway sign support

Test Level: NCHRP Report 350 Test Level 3

Testing conducted by: N/A

Date of request: May 15, 2013

Date initially acknowledged: June 12, 2013

Date of completed package: May 15, 2013

Decision 

The following device is eligible, with details provided in the form which is attached as an 

integral part of this letter:

• Centerline Supply Triangular Slipbase Breakaway Sign Support with Locking Sign 

Collar Assembly 

Based on a review of crash test results referenced by the manufacturer certifying the device 

described herein conforms to the Texas Department of Transportation standard triangular slip 

base for small sign supports, and 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.
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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 and drawing. It 

augments the standard generic three-bolt slip base breakaway sign support by adding a collar and 

locking mechanism to prevent the sign from rotating due to vibrations. 

Summary and Standard Provisions

Therefore, the system described and detailed in the attached form and drawings 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:

• This finding of eligibility does not cover other structural features of the systems, nor 

conformity with the Manual on Uniform Traffic Control Devices.

• Any changes that may influence system conformance with NCHRP Report 350 criteria 

will require a new reimbursement eligibility letter.

• Should the FHWA discover that the qualification testing was flawed, that in-service 

performance reveals safety problems, or that the system is significantly different from the 

version that was crash tested, we reserve the right to modify or revoke this letter.

• You are expected to supply potential users with sufficient information on design and 

installation 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 crash test and evaluation criteria of the NCHRP Report 350.

• To prevent misunderstanding by others, this letter of eligibility is designated as number 

SS-179 and shall not be reproduced except in full. This letter and the test documentation 

upon which it is based are public information. All such letters and documentation may be 

reviewed at our office upon request. 

• This letter shall not be construed as authorization or consent by the FHWA to use, 

manufacture, or sell any patented system for which the applicant is not the patent holder. 

The FHWA does not become involved in issues concerning patent law. Patent issues, if 

any, are to be resolved by the applicant.

• The Centerline Supply Triangular Slipbase Locking Sign Collar Assembly is a patented 

product and considered proprietary. If proprietary systems are specified by a highway 

agency for use on Federal-aid projects: (a) they must be supplied through competitive 

bidding with equally suitable unpatented items; (b) the highway agency must certify that 

they are essential for synchronization with the existing highway facilities or that no 

equally suitable alternative exists; or (c) they must be used for research or for a 
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distinctive type 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,

Michael S. Griffith

Director, Office of Safety Technologies

Office of Safety

Enclosures