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                Safety Eligibility Letter B-143
  
  **Hardware Type:**
            Longitudinal Barriers and Bridge Rails
                          **Code:**
            B-143
                          **Date:**
            02/09/2006
                          **Testing Criteria:**
            NCHRP 350
                          **Manufacturer:**
            Wyoming DOT
                          **Device Description:**
            Box-beam transition to concrete
                          **View PDF:**
            b143.pdf (503.68 KB)
    
    HSA-10/B-143



DOT logo
U.S. Department of Transportation
**Federal Highway Administration**
400 Seventh St., S.W.
Washington, D.C.  20590February 9, 2006
In Reply Refer To:HSA-10/B-143

Mr. William B. Williams, P.E.
 Standards  Engineer
 Wyoming  Department of Transportation
 5300  Bishop Boulevard
 Cheyenne,  Wyoming 82009-3340****
	
Dear  Mr. Williams :
In your letter dated January 17  you requested formal Federal Highway Administration (FHWA) acceptance of a  transition design from a box-beam guardrail to a permanent concrete  barrier. You further requested FHWA’s  approval to use this design connected to a vertical concrete barrier, a New  Jersey or F-shape concrete barrier, or to a single-slope concrete barrier. Drawings of the transition showing general  details and schematics of its connection to the four concrete barrier profiles  noted above are enclosed with this letter.  I assume that anyone requiring detailed drawings of this non-proprietary  design may obtain them through your office.
Based on its similarity to the  transition design tested for use with your Wyoming steel post and beam bridge  rail (FHWA acceptance letter B37A) and particularly the design tested with the  BEAT-SSCC (FHWA acceptance letter CC69B), I agree that your proposed transition  may be considered a crashworthy design meeting National Cooperative Highway  Research Program Report 350 test level 3 without further testing. The addition of the steel rubrail and the  modification of each of the safety shapes to a vertical wall at the connection  point appear to be significant improvements over the BEAT-SSCC design.
Sincerely  yours,
***/original signed  by/*****John R.  Baxter, P.E.
       Director,  Office of Safety Design 
      Office  of Safety**
4 Enclosures U.S. DEPARTMENT OF TRANSPORTATION

**Federal Highway Administration**

1200 NEW JERSEY AVENUE, SE

WASHINGTON, DC 20590

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