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FHWA Home / Safety / Roadway Departure / Safety Eligibility Letter

Safety Eligibility Letter CC-121

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U.S. Department of Transportation
Federal Highway Administration

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

July 30, 2012

In Reply Refer To: HSST/HSST/CC-112A

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: 3-bay QuadGuard® M10 (QG M10) Narrow & Wide
Type of system: Redirective Crash Cushion
Test Level: AASHTO Manual for Assessing Safety Hardware (MASH) Test Level 2 (TL-2)
Testing conducted by: E-Tech Testing Services, Inc.
Task Force 13 Designator:

SCI30: QG M10 Narrow
SCI31: QG M10 Wide

Date of request: March 3, 2011
Date of completed package:

June 15, 2012

Decision
The following device is eligible, with details provided in the form which is attached as an integral part of this letter:

Based on a review of crash test results submitted by the manufacturer certifying the device described herein meets the crash test and evaluation 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
To be found eligible for Federal-aid funding, roadside safety devices should meet the crash test and evaluation criteria contained in the American Association of State Highway and Transportation Officials' Manual for Assessing Safety Hardware (MASH).

Description
The QG M10 Narrow and QG M10 Wide TL-2 systems are redirective, non-gating 3-bay crash cushions. The nose cartridge is not counted as a separate bay. The MASH design has been revised from the National Cooperative Highway Research Program (NCHRP) Report 350 design to include:

The QG M10 3-bay system has an overall length of 13 feet (3.96 meters) and can be configured with backup widths of 24 inches [610 millimeters), 30 inches (762 millimeters), and 36 inches (914 millimeters) for QG M10 Narrow systems, and 69 inches (1753 millimeters) and 90 inches (2285 millimeters) for QG M10 Wide systems.  The overall height is 32 inches (817 millimeters). The system consists of energy absorbing cartridges surrounded by a framework of steel Quad-Beam™ guardrail panels that telescope rearward during head-on impacts.  The system has a backup structure that will resist movement during head-on impacts and a center monorail that will resist lateral movement during side impacts when anchored to an asphalt or concrete base as per manufacturer specifications.

Components from the TL-3 version of the QG II unit that are used on the new TL-2 3-bay QG M10 unit are:

Components that were modified or added to the TL-2 QG M10 to achieve the required performance include:

Design details of the 3-bay QG M10 systems, both narrow and wide are included as an enclosure to this correspondence.

Findings
Full-scale physical crash testing was conducted according to the MASH. The following tables list all required crash tests per MASH for Test Level 2 Systems:

Narrow Systems 24 inches (610 millimeters), 30 inches
(762 millimeters), and 36 inches (914 millimeters)

Illustration Test # Completed Notes
Test# 2-30 Illustration 2-30 NO Test 2-32 was passed with a 3-Bay 2286 mm [90 inches] Wide System. This test was completed as worst case for the 1100C and thus Test 2-30 can be waived for the Narrow Systems.
Test# 2-31 Illustration 2-31 YES 3-Bay 610 mm [24 inches] Narrow System was tested.
- Impact speed = 70.6 km/h
- Ridedown = -15.1 g's
- Longitudinal ΔV = 9.0 m/s
Passed all ORV's. In addition and as per AASHTO MASH Section G, an analysis was subsequently conducted on Test 2-31 data. The analysis results has determined MASH Test 2-38 (i.e., 1500A mid-sized vehicle) is required.

Test# 2-32 Illustration 2-32 NO
  • Test 2-32 was passed with a 3-Bay 2286 mm [90 inches] Wide System. This test was completed as worst case for the 1100C and thus Test 2-32 can be waived for the Narrow Systems.
Test# 2-33 Illustration 2-33 NO
  • Test 2-31 was passed with a 3-Bay 610 mm [24 inches] Narrow System, tested system capacity for the 2270P and is considered worst case and thus Test 2-33 can be waived for the Narrow Systems.
Test# 2-34 Illustration 2-34 NO
  • Test 3-34 was passed with a 6-Bay 610 mm [24 inches] Narrow System during the QG M10 TL-3 test program.  Test 3-34 is more severe than Test 2-34 and thus Test 2-34 can be waived for the Narrow Systems.
Test# 2-35 Illustration 2-35 NO
  • Test 3-35 was passed with a 6-Bay 610 mm [24 inches] Narrow System during the QG M10 TL-3 test program.  Due to the lateral stiffness of the QuadGuard M10, this test is the same as Test 2-36 and thus can be waived for the Narrow Systems.
Test# 2-36 Illustration 2-36 NO
  • Test 3-36 was passed  on 6-Bay 610 mm [24 inches] System during the QG M10 TL-3 test program.  Test 3-36 is more severe than Test 2-36 and thus Test 2-36 can be waived for Narrow Systems.
Test# 2-37 Illustration 2-37 NO
  • Test 3-37 was passed  on 6-Bay 610 mm [24 inches] System during the QG M10 TL-3 test program.  Test 3-37 is more severe than Test 2-37 and thus Test 2-37 can be waived.
Test# 2-38 Illustration 2-38 YES 3-Bay 610 mm [24 inches] Narrow System was tested.
- Impact speed = 68.3 km/h
- Ridedown = -15.9 g's
- Longitudinal ΔV = 8.6 m/s
Passed all ORV's for Test 2-38

Wide Systems 69 inches (1753 millimeters)
and 90 inches (2285 millimeters)

Illustration Test # Completed Notes
Test# 2-30 Illustration 2-30 NO
  • Test 2-32 was passed with a 3-Bay 2286 mm [90 inches] Wide System. This test was completed as worst case for the 1100C and thus Test 2-30 can be waived for the Wide Systems.
 

Test# 2-31 Illustration

2-31 NO
  • Test 2-31 was passed with a 3-Bay 610 mm [24 inches] Narrow System, tested system capacity for the 2270P and is considered worst case and thus Test 2-31 can be waived for the Wide Systems.
Test# 2-32 Illustration 2-32 YES 3-Bay 2286 mm (90 inches) Wide System was tested.
- Impact speed = 70.3 km/h
- Ridedown = -13.5 g's
- Longitudinal ΔV = 9.9 m/s
Passed all ORV's.
Test# 2-33 Illustration 2-33 NO
  • Test 2-31 was passed with a 3-Bay 610 mm [24 inches] Narrow System, tested system capacity for the 2270P, and is considered worst case and thus Test 2-33 can be waived for the Wide Systems.
Test# 2-34 Illustration 2-34 NO
  • Test 3-34 was passed with a 3-Bay 610 mm [24 inches] Narrow System during the QG M10 TL-3 test program.  Test 3-34 is more severe than Test 2-34 on a Wide System and thus Test 2-34 can be waived for the Wide Systems
Test# 2-35 Illustration 2-35 NO
  • Test 3-35 was passed with a 3-Bay 610 mm [24 inches] Narrow System during the QG M10 TL-3 test program.  Test 3-35 is more severe than Test 2-35 on a Wide System and thus Test 2-35 can be waived for the Wide Systems
 

Test# 2-36 Illustration

2-36 NO
  • Test 3-36 was passed on 6-Bay 2286 mm [90 inches] Wide System during the QG M10 TL-3 test program. Test 3-36 is more severe than Test 2-36 on a Wide System and thus Test 2-36 can be waived for Wide Systems.
Test# 2-37 Illustration 2-37 NO
  • Test 3-37 was passed on 6-Bay 610 mm [24 inches] System during the QG M10 TL-3 test program.  Test 3-37 is more severe than Test 2-37 on a Narrow System and thus Test 2-37 can be waived for Wide Systems
Test# 2-38 Illustration 2-38 NO
  • Test 2-38 was passed with a 3-Bay 610 mm [24 inches] Narrow System and is considered no different for a Wide System and thus Test 2-38 can be waived for the Wide Systems

Since the shorter 3-Bay wide system has a side that is at a steeper angle (10 degrees) than that of the 6-Bay wide system (5 degrees), this 3- Bay wide system installation specification must indicate the traffic-side panels as parallel as possible to the edge of the road or travel way, but no more than 5 degrees off parallel.

One-page test summaries for each of the conducted crash tests are included as enclosures to this correspondence. In addition, NCHRP Report 350 crash test summary sheets as also included for 5-bay QG II (wide) and original QG (narrow) systems.

Manufacturer requests previous successfully conducted MASH TL-3 tests 3-34, 3-35, 3-36, and 3-37 be accepted in lieu of proposed MASH TL-2, tests 2-34, 2-35, 2-36, and 2-37 because the redirective ability of the QGM10 is not reduced due to its length due to most of anchor loading occurred in the immediate initial impact area and was not transmitted to adjacent diaphragms.

Summary and Standard Provisions
Therefore, the system described and detailed within 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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