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FHWA Home / Safety / Roadway Departure / Safety Eligibility Letter

Safety Eligibility Letter CC-35G

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U.S. Department of Transportation
Federal Highway Administration

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

November 1, 2004

Reply Refer To: HSA-10/CC-35G

Barry D. Stephens, P.E.
November 1, 2004
Senior Vice President of Engineering
Energy Absorption Systems, Incorporated
3 617 Cincinnati A venue
Rocklin, California 95765

Dear Mr. Stephens:

In my December 10, 2003 letter to you, the Federal Highway Administration accepted a modified design for your QuadGuard CZ in which the unit was mounted on a 42-inch wide steel plate anchored to the ground. In your recent October 1, 2004, letter, you requested formal acceptance of a new method for anchoring the steel plate to the ground which eliminates the need for a concrete or asphalt pad, thus making the attenuator easier to install for temporary use in many work zones. The new anchoring system, named the Drivable Pile Anchor (DP A) System and shown in Enclosure I ,consists of a set of steel wing plates (9.5-mm thick × 304-mm wide × 1791-mm long) bolted underneath the QuadGuard base plate and pinned to the ground with 152 mm × 152 mm × 6.35 mm square steel tubes driven 1848 mm deep into a strong soil through square holes in each wing plate. These steel tubes are then capped with a 254 mm × 254 mm × 19 mm steel plate using four 19 mm Grade 8 bolts.

To verify acceptable crash performance of the DP A System, E-TECH Testing Services, Inc. conducted the two National Cooperative Highway Research Program (NCHRP) Report 350 tests that members of my staff had previously agreed would likely place the greatest loading on the anchoring system. In both instances, the QuadGuard performed as it had in previous tests when mounted to a concrete or asphalt pad and neither the steel base plate nor the wing plates showed any significant displacement. The summary results oftest 3-33 and 3-38 are attached as Enclosures 2A and 2B, respectively. Since the new anchorage system was being tested rather than the QuadGuard itself, the failure of the data recording devices in test 3-38 does not invalidate the test because that test was successfully completed earlier with a permanently installed QuadGuard and vehicle crash and post-crash behavior was similar in both tests. I also noted that both new tests were conducted into a 9-bay unit at speeds of 113 km/h, over and above the standard test level 3 (TL-3) speed of 100 km/h.

Based on the information you provided, I agree that any of the previously accepted Quad Guard CZ configurations mounted on a steel plate bolted to a concrete or asphalt pad may also be anchored directly over a strong soil using the DP A anchoring system as described above and as shown on the attached drawing. Both the NCHRP Report 350 test level and the number of wing plates required will depend on the number of bays used at a specific site, with a minimum of two wing plates needed for a 3-bay TL-2 design.

 

Sincerely yours,

/* Signature of John R. Baxter.*/
John R. Baxter, P.E.
Director, Office of Safety Design
Office of Safety

Enclosures

Buckle Up America Logo

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Quadguard Drivalbe Pile Anchor Diagram

Figure 1. Summary of Results – QuadGuard QH2409PY Test 01-5500-007
The results of this report relate only to the QuadGuard QH2409PY configuration tested. This report may not be reproduced except in full, without the prior written approval of E-TECH Testing Services, Inc. Prepared by: John F. LaTurner, P.E. - Manager. Report 238 - Issued 8/09/2004

General Information
   Test Agency E-TECH Testing Services, Inc
   Test Designation NCHRP 350 Test 3-33 (Modified)
   Test No. 01-5500-007
   Date 08/03/04
Test Article
   Type Energy Absorption Systems, Inc.
QuadGuard QH2409PY
   Installation Length 9 bay 8.92 m long 0.61 m wide
   Size and/or dimension and material of key elements (2) Type I cartridges in bays 3,4
(5) Type II cartridges in bays 5-9
      Foundation and Anchoring Anchoring plate and combined wing anchor plate 1.79 m wide with (8) Drivable Pile Anchors(DPA) 1.85 m embedment into NCHRP 350 strong soil
Test Vehicle
   Type Production Model
   Designation 2000P
   Model 1988 GMC C2500 Pickup
   Mass (kg)
      Curb 1968
      Test inertial 1992
      Dummy N/A
      Gross Static 1992
Impact Conditions
   Speed (km/h)e 113.7
   Angle (deg) 15
   Impact Severity (kJ)e 993.2
Exit conditions
Speed (km/h) N/A
Angle (deg) N/A
Occupant Risk Values
Impact Velocity (m/s)
x-direction 8.5
y-direction -2.3
Ridedown Acceleration (g's)
x-direction -14.1
y-direction -5.0
European Committee for Normalization (CEN) Values
THIV (km/h) 32.5
PHD (g's) 14.3
ASI 1.
Post-Impact Vehicular Behavior (deg - rate gyro)
Maximum Roll Angle -38.2
Maximum Pitch Angle -11.0
Maximum Yaw Angle -243.4
Test Article Deflections (m) Permanent 5.8
Vehicle Damage (Primary Impact) Exterior
VDS FC-4
CDC 12FCEW3
Interior
VCDI AS0000000
Maximum Deformation (mm) Negligible

Figure 1. Summary of Results – QuadGuard QH2409PY Test 01-5500-007
The results of this report relate only to the QuadGuard QH2409PY configuration tested. This report may not be reproduced except in full, without the prior written approval of E-TECH Testing Services, Inc. Prepared by: John F. LaTurner, P.E. – Manager. Report 238 – Issued 8/09/2004

General Information
   Test Agency E-TECH Testing Services, Inc
   Test Designation NCHRP 350 Test 3-38 (Modified)
   Test No. 01-5500-008
   Date 09/22/04
Test Article
   Type Energy Absorption Systems, Inc.
QuadGuard QH2409PY
   Installation Length 9 bay 8.92 m long 0.61 m wide
   Size and/or dimension and material of key elements (2) Type I cartridges in bays 3,4
(5) Type II cartridges in bays 5-9
      Foundation and Anchoring Anchoring plate and combined wing anchor plate 1.79 m wide with (8) Drivable Pile Anchors(DPA) 1.85 m embedment into NCHRP 350 strong soil
Test Vehicle
   Type Production Model
   Designation 2000P
   Model 1989 Chevrolet C2500 Pickup
   Mass (kg)
      Curb 1978
      Test inertial 1994
      Dummy N/A
      Gross Static 1994
Impact Conditions
   Speed (km/h)e 113.6
   Angle (deg) 20
   Impact Severity (kJ)e 116.2
Exit conditions
    Speed (km/h) N/A*
    Angle (deg) 5
Occupant Risk Values N/A*
    Impact Velocity (m/s)
        x-direction  
        y-direction  
Ridedown Acceleration (g's)
        x-direction  
        y-direction  
European Committee for Normalization (CEN) Values N/A*
    THIV (km/h)  
    PHD (g's)  
    ASI  
Post-Impact Vehicular Behavior (deg - rate gyro) N/A*
    Maximum Roll Angle  
    Maximum Pitch Angle  
    Maximum Yaw Angle  
Test Article Deflections (m)
Dynamic / Permanent
0.1/0.1
Vehicle Damage (Primary Impact)
    Exterior
    VDC FC-4
    CDC 11LFEW2
Interior
VCDI AS0000000
Maximum Deformation (mm) 50

Figure 1. Summary of Results – QuadGuard QH2409PY Test 01-5500-008
The results of this report relate only to the QuadGuard QH2409PY configuration tested. This report may not be reproduced except in full, without the prior written approval of E-TECH Testing Services, Inc.
Prepared by: John F. LaTurner, P.E. – Manager. Report 240 – Issued 9/28/2004

Page last modified on January 17, 2013.
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