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FHWA Home / Safety / Roadway Departure / Safety Eligibility Letter SS-175

Safety Eligibility Letter SS-175 - 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-175

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: Surface Mount Slip Bases SMSB10-10-G and SMSB8-10-G
Type of system: Triangular Slip Base Small Sign Support for Perforated
Square Steel Tube (PSST) posts
Test Level: NCHRP Report 350 Test Level 3
Testing conducted by:

N/A

Date of request: June 28, 2011

Decision:
The following devices are 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 contained in 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
You requested our review of two new slip base components that would work with your NCHRP Report 350 compliant Slip Base Tops and would use your Redi-Torque Hardware.  The 8-inch version has the same geometry as your existing 8-inch Slip Base Tops, and the 10 3/8-inch version that has the same geometry as your existing 10 3/8-inch Slip Base Tops.  You provided calculations (enclosed for reference) that show that both of the Surface Mount Slip Bases are stronger than the posts that they would support.  They would be secured to flat concrete surfaces using standard concrete anchors that would be required to exceed the load capacities of the slip base & sign assembly to ensure proper functionality of the slip bases.  The surface mount allows for installations on top of concrete medians instead of coring a large hole into them, when a slip base is desired in place of other sign post mounting devices. This mounting system is similar to the rigid foundations used when larger sized slip bases are crash tested.

Summary and Standard Provisions
Therefore, the systems described above and detailed in the enclosed drawings are 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.
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