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FHWA Home / Safety / Roadway Departure / Safety Eligibility Letter

Safety Eligibility Letter CC-112b

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U.S. Department of Transportation
Federal Highway Administration

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

March 8, 2012

In Reply Refer To:
HSST/CC-112B

Mr. Barry D. Stephens, P.E.
Sr. Vice President Engineering
Energy Absorption Systems, Inc.
3617 Cincinnati Avenue
Rocklin, CA  95678

Dear Mr. Stephens:

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: 2-bay to 6-bay QuadGuard® M10 CZ (24", 30" and 36")
Type of system: Impact Attenuator with Transitions
Test Level: AASHTO Manual for Assessing Safety Hardware (MASH)  Test Level 3 (TL-3)
Testing conducted by: E-Tech Testing Services, Inc.
Task Force 13 Designator: SCI26b
Date of request: March 11, 2011
Date initially acknowledged: March 11, 2011
Date of completed package:

February 10, 2012

Decision
The following devices are eligible, with details provided:

Based on a review of crash test results submitted by the manufacturer certifying the device described herein meets the crashworthiness criteria of the American Association of State Highway and Transportation Officials' Manual for Assessing Safety Hardware (MASH), 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 MASH.

Description
The 6-bay QuadGuard (QG) M10 CZ is identical to the 6-bay QuadGuard M10 except for its anchoring system. The QG M10 CZ is installed using the "MP-3 Longbolt System," which uses a two-part polyester grout to anchor ¾-inch diameter by 18 inches long threaded rods to a foundation of 6 inches deep asphalt over a 6 inches deep compacted sub-base. The rods are to be embedded to a minimum depth of 16 inches into 7/8-inch diameter drilled holes. A total of 50 anchors are needed. The anchoring system and one-page test summary are included as an enclosure to this correspondence.

Crash Testing
The following MASH Test 3-35 was completed for FHWA review of the QG M10 CZ 610 mm [24 inch] Parallel system:

QuadGuard M10 CZ

The summary of the above test is included as an enclosure to this correspondence.

The following lists all required tests for TL3 as per the MASH. In addition, crash test 3-35 was the only physical test conducted with asphalt anchorage as this specific test is considered the worst case, or greatest loading, on the asphalt anchors.  All other MASH Tests are as referenced in existing FHWA eligibility letter HSST/CC-112 dated February 9, 2011.

MASH Test Illustration MASH Test # Completed Notes
3-30 NO Test 3-32 was completed as Worst Case for 1100C.
3-31 YES* Passed all ORV's.
6-Bay 610 mm [24 inches] Narrow System was tested and passed all Occupant Risk Values. This test was completed on concrete. Test 3-35 is the worst case for asphalt.
*FHWA eligibility letter HSST/CC-112 dated February 9, 2011
3-32 YES* Passed all ORV's.
5-Bay 914 mm [36 inches] Narrow System was tested. This test was completed on concrete. Test 3-35 below is the worst case for asphalt.
3-33 NO Test 3-31 tested system capacity for 2270P and is considered worst case. Test 3-35 below is worst case for asphalt.
3-34 YES* Passed all ORV's.
5-Bay 610 mm [24 inches] Narrow System was tested. This test was completed on concrete. Test 3-35 below is the worst case for asphalt.
3-35 YES This test was completed on asphalt. This test exerts the most intense forces on the anchors.  
3-36 YES* Passed all ORV's.
5-Bay 610 mm [24 inches] Narrow System with no new nose brackets was tested. Test was completed on concrete.  This test applies the force on the anchors as test 3-35.
3-37 YES*

Passed all ORV's.
6-Bay 610 mm [24 inches] Narrow System attached to a w-beam transition. This test was completed on concrete. Test 3-35 is the worst case for asphalt.

3-38 YES* The recommended MASH analysis was completed and all calculated ORV's passed.  This test was completed on concrete. Test 3-35 is the worst case for asphalt.
  1. 6-bay QuadGuard M10 CZ Narrow Systems 6-bay 610 millimeters (24 inches), 762 millimeters (30 inches), and 914 millimeters (36 inches):
    Based on a review of previous QuadGuard testing, Test 3-35 (2270 kg pickup truck at 100 km/h impact at 25 degrees at the beginning of the attenuator length of need) is the most severe test of the anchoring system. Testing results of the MASH Test 3-35 as conducted on the as described system meets the evaluation criteria for a MASH redirective, non-gating crash cushion at TL-3 impact conditions. In addition, submitted static computations indicate this test is the worst case for impact loadings translated to anchorage bolts.  In regards to other required testing as per MASH, this submission provides the required documentation for requesting waiver of these tests.  Therefore the 6-bay QuadGuard M10 CZ Narrow Systems 6-bay 610 millimeters (24 inches), 762 millimeters (30 inches), and 914 millimeters (36 inches) meet the evaluation criteria for a MASH redirective, non-gating crash cushion at TL-3 impact conditions are eligible for reimbursement under the Federal-aid highway program when such use is acceptable to the contracting authority.
  2. 2-bay to 5-bay QuadGuard M10 CZ Narrow Systems 610 millimeters (24 inches), 762 millimeters (30 inches), and 914 millimeters (36 inches):
    Both as submitted and as referenced testing indicate these devices as described herein shall also be eligible for reimbursement under the Federal-aid highway program to a highway agency wishing to specify an attenuator with capacity for use at speeds from 40 to 90 km/h.

Please note the following standard provisions that apply to the FHWA letters of acceptance:

 

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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