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FHWA Home / Safety / Roadway Departure / Safety Eligibility Letter

Safety Eligibility Letter CC-88E

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U.S. Department of Transportation
Federal Highway Administration

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

December 23, 2011

In Reply Refer To: HSST/CC-88E

Mr. John Durkos
VP Technical Support and Marketing
Road Systems, Inc.
3616 Howard County Airport Road
Big Spring, TX 79720

Dear Mr. Durkos:

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: Flared Median Terminal (FLEAT-MT) for the Midwest Guardrail System (MGS)
Type of system:

Flared Energy Absorbing Terminal

Test Level: NCHRP 350 Test Level 3 (TL-3)
Testing conducted by: 'n/a'
Task Force 13 Designator: SEW16b
Date of request: September 20, 2011
Date initially acknowledged: September 27, 2011
Date of completed package: January 20, 2012

Decision
The following device was found acceptable, with details provided below:

Based on a review of crash test results submitted by the manufacturer certifying the device described herein meets the crashworthiness 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
Roadside safety devices should meet the guidelines contained in the National Cooperative Highway Research Program (NCHRP) Report 350.

Description
The FLEAT-MT terminal is identical to the standard NCHRP 350 FLEAT-MT terminal as per HSA-10/CC46D dated August 24, 2001 except for the following:

  1. The nominal top mounting height for the W-beam rail is increased from 700 millimeters (27- 5/8 inches) to 787 millimeters (31 inches) to match the MGS guardrail. Correspondingly, the rail center height is increased from 545 millimeters (21 ½ inches) to 632 millimeters (24 7/8 inches).
  2. Post embedment depth is reduced by 87 millimeters (3-3/8 in.) to 1,019 millimeters (40 in.) in order to accommodate the increased mounting height.
  3. Rail element is spliced mid-span between the posts.
  4. In order to accommodate the mid-span splice and the 5.72 meters (18 feet 9 inches) singlefaced portion of the terminal on the traffic side, the following panel lengths are recommended for the MGS terminal. On the traffic side – 3.81 meters (12 feet 6 inches) for the end panel, 4.76 meters (15 feet 7 ½ inches) for the second panel, and 3.81 meters (12 feet 6 inches) for the third panel. On the back side (i.e., double-faced section) – 3.81 meters (12 feet 6 inches) for the end panel and 2.86 meters (9 feet 4 ½ inches) for the second panel. This combination of panel lengths would allow both sides of the terminal to end mid-span at the typical 12.38 meters (40 feet 7 ½ inches) pay limit.
  5. Depth of the wood spacer blocks is increased from 203 millimeters (8 inches) to 305 millimeters (12 inches).

In addition to this steel post system, a wood post version of this system is also requested. The FLEAT-MT terminal wood post option is identical to the standard NCHRP 350 FLEAT-MT wood post terminal as per HSA-10/CC46C dated June 1, 2001, except for the above stated revisions as for steel post version.

Design details for both steel and wood post versions are provided as enclosure to this correspondence.

Findings
The FLEAT-MT steel and wood post versions have been successfully crash tested as per NCHRP 350 criteria and have been in service for several years. The as described revisions that accommodate generic MGS guardrail system are considered modifications that do not affect the structure of the as-tested hardware. In addition and in support of this testing is the previous successful testing as per NCHRP 350 for the MGS terminal roadside FLEAT as per HSSD/CC- 88D dated January 29, 2010.

Therefore, the system described and detailed in this correspondence 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 January 17, 2013.
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