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                Safety Eligibility Letter SS-175
  
  **Hardware Type:**
            Sign Supports, Mailboxes, and Delineator Posts
                          **Code:**
            SS-175
                          **Date:**
            05/04/2012
                          **Testing Criteria:**
            NCHRP 350
                          **Manufacturer:**
            Xcessories Squared
                          **Device Description:**
            Surface Mount Slip Bases SMSB10-10-G and SMSB8-10-G
                          **View PDF:**
            ss175.pdf (417.38 KB)
    
    Safety Eligibility Letter SS-175 - Safety

			

						
**Download Version**PDF [417 KB]

DOT logoU.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-GType of system:

 	 Triangular Slip Base Small Sign Support for Perforated
Square Steel Tube (PSST) postsTest Level:

 	 NCHRP Report 350 Test Level 3Testing conducted by:
  	  
  	  N/ADate of request:
  	   June 28, 2011**Decision:**
The following devices are eligible, with details provided  below
Surface Mount Slip Bases SMSB10-10-G and  SMSB8-10-GBased 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:
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-175 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.Sincerely yours,
  
  */* Signature of Michael S. Griffith */*
  
  Michael S. Griffith
 Director, Office of Safety Technologies
 Office of SafetyEnclosures U.S. DEPARTMENT OF TRANSPORTATION

**Federal Highway Administration**

1200 NEW JERSEY AVENUE, SE

WASHINGTON, DC 20590

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