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U.S. Department of Transportation

Federal Highway Administration

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

February 12, 2008

In Reply Refer To: HSSD/SS-158

Mr. Todd Jackson
Deputy Director of Engineering
ACS Inc.
12410 Milestone Center Drive, Suite 400
Germantown, MD 20876

Dear Mr. Jacksoon

In your mail correspondence of September 3, 2007 was received by our office via courier service in December 18, 2007 and requested the Federal Highway Administration’s (FHWA) acceptance of your company's ACS Red Light Camera mounted on the previously accepted breakaway sign post, the Pelco GS-11 pole and base support, for use on the National Highway System (NHS) under the provisions of the National Cooperative Highway Research Program (NCHRP) Report 350 "Recommended Procedures for the Safety Performance Evaluation of Highway Features". Accompanying your letter were the details of the crash test results presented in a report prepared by E-Tech Testing Services, an accredited laboratory. The summary of crash test results and a drawing of the ACS Red Light Camera are enclosed.

The tested installation included an ACS Red Light Camera mounted on a Pelco GS-11 pole and base. The installation system includes the 15 inches (380 mm) high cast aluminum Pelco base with PB-5325 reinforcing collar, 4.5 inch (114 mm) diameter by 0.43 inch (11 mm) thick spun aluminum pole, ACS GS-11 camera unit (mounting height of (10 feet (3.05 m)), 2 feet (610 mm) diameter by 4 feet (1220 mm) deep reinforced concrete pile foundation (3.94 inches (100 mm) above grade), and accompanying 0.984 inch (25 mm) diameter 90 degrees anchor bolts with washers and locking nuts mounting hardware. A steel weight was secured inside the GS-11 camera enclosure to simulate the mass of the corresponding 18 kg red light camera. The total test article mass was 110 kg. This installation was assembled and positioned according to the manufacturer’s instructions.

Testing of the Pelco GS-11 pole and base was previously conducted for the NCHRP Report 350 Test 2-60 and accepted by the FHWA in May 1992. You recently conducted Test 2-61 to meet Test Level 2 acceptance criteria and to verify the performance of the breakaway pole with the ACS Red Light Camera mounted to it. During the test, the vehicle bumper contacted the lower portion of the support approximately 432 mm above grove ground level. The Pelco base fractured near the foundation level and the support pole flipped above the vehicle while the vehicle passed underneath it without further contact. The Pelco GS-11 pole and base activated in a predictable manner by fracturing and breaking away and the remaining stub height did not exceed 4 inches (xx mm). The ACS Red Light Camera remained securely mounted to the pole. The maximum occupant impact velocity was 3.0 m/s and the maximum occupant ridedown acceleration was 7.3 g’s.

When the ACS Red Light Camera mounted on a Pelco GS-11 pole and base are installed as described above then it is acceptable for use at all appropriate locations on the NHS as a Test Level 2 device under the provisions of NCHRP Report 350 when selected by the contracting authority.

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

Sincerely yours,

David A. Nicol

David A. Nicol   
Director, Office of Safety Design
Office of Safety


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