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FHWA Home / Safety / Roadway Departure / Safety Eligibility Letter SS-131A

Safety Eligibility Letter SS-131A - Safety

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U.S. Department of Transportation
Federal Highway Administration

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

May 4, 2012

In Reply Refer To:
HSST/SS-131A

Greg Kirchgesner
Xcessories Squared
P.O. Box 135
Auburn, Illinois 62615

Dear Mr. Kirchgesner:

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: Kleen Break Sign Post Coupler
Type of system: Breakaway Small Sign Support for Perforated Square Steel Tube (PSST) posts
Test Level: NCHRP Report 350 Test Level 3
Testing conducted by: N/A
Task Force 13 Designator: SSC08a-c
Date of request: June 6, 2011

Decision:
The following device is eligible, with details provided below

Based on a review of the information and calculations 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 of the National Cooperative Highway Research Program (NCHRP) Report 350 or the American Association of State Highway and Transportation Officials’ Manual for Assessing Safety Hardware (MASH).   
Description
The new coupler hardware would allow the product to accommodate 2-1/4" (14ga or 12 ga) and 2-1/2" (12ga or 10ga) PSST.  The new product configuration would use the same shear bolt hardware set, including the breakaway bolt, which was in the original Kleen Break in FHWA Letter SS-131 dated December 2, 2005, under NCHRP 350.  Since the new design uses the same shear bolt and has the same breakaway functionality, it will break away at the same energy level as the original design.  The newer design for the larger size posts uses the same Locking Wedge as the original design, so the square tube posts are attached to the top casting in the same manner as the original design.  The larger square tube would have a slightly larger section modulus than the original tested product.

The new parts include a new cast stem base (CKB250-8-G) that fit into a 3" x 7ga square anchor, a new cast surface mount base (SMKB4) that will mount to the top of an existing concrete surface, a new cast top post receiver (TX225-250-G) which will accept 2-1/4" and 2-1/2" square tube (not at the same time), and a larger diameter rubber bushing (RB45-EPDM) to better fit the new castings.  The new parts do not replace the original parts, but would be offered as an additional option to fit the two larger square sign post sizes.  All of the new parts have the same material specifications as the parts that were originally covered in SS-131.

Summary and Standard Provisions
Therefore, the system described and detailed in the attached form 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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