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                Safety Eligibility Letter B-64C
  
  **Hardware Type:**
            Longitudinal Barriers and Bridge Rails
                          **Code:**
            B-64C
                          **Date:**
            04/21/2003
                          **Testing Criteria:**
            NCHRP 350
                          **Manufacturer:**
            MwRSF - UN
                          **Device Description:**
            w-beam application for a 2:1 slope @ TL-3
                          **View PDF:**
            b64c.pdf (51.51 KB)
    
    

April 21, 2003

Refer to:  HSA-10/B-64C

Ronald K. Faller, Ph.D., P.E.

Research Assistant Professor

Midwest Roadside Safety Facility

P.O. Box 880601

Lincoln, NE 

68588-0601

Dear Dr. Faller:

In your letter dated October 24, 2002, you requested formal

Federal Highway Administration acceptance of a W-beam guardrail installation

with the support posts set at the hinge point of a 2:1 earth slope.

The tested installation used 2134-mm long W152 x 13.4 steel

posts with standard routed wood offset blocks. 

The posts were set on 952.5-mm centers with the top of the W-beam 706 mm

above the ground.  This design

successfully contained and redirected the 2000-kg pickup truck impacting at

28.5 degrees and 100.7 km/h.  Barrier

dynamic deflection was 821 mm and vehicle roll and pitch were estimated to be

28 degrees and 17 degrees, respectively. 

This design met National Cooperative Highway Research Report (NCHRP) 350

at test level 3 (TL-3) and may be used on the National Highway System (NHS)

when such use is acceptable to the contracting authority.  The test parameters and results noted above

are contained in your October 2000 report entitled "Development of a W-Beam

Guardrail System for Use on a 2:1 Slope."

Sincerely

yours,

(original

signed by Harry W. Taylor)

for:

Michael S.

Griffith

Acting

Director, Office of Safety Design

Office

of Safety U.S. DEPARTMENT OF TRANSPORTATION

**Federal Highway Administration**

1200 NEW JERSEY AVENUE, SE

WASHINGTON, DC 20590

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