United States Department of Transportation
i
Evaluation of microwave traffic detector at the Chemawa Road/Interstate 5 interchange: final report.
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2002-04-01
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By Edgar, Rob
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Abstract:In 2001, the Oregon Department of Transportation installed a microwave traffic detection sensor, and compared it’s performance to conventional inductive traffic loops. The objective of the study was to evaluate the capabilities of the microwave traffic detection sensor to function as a viable detection device in a signalized intersection. The sensor was to detect vehicles in advance of the intersection, providing “extension” and “call” functions for the signal controller. The microwave detector provides a non-intrusive method of detection and the need to cut grooves is eliminated. The microwave can be installed and maintained from the shoulder area with lower impact on the motorist. Safety for highway workers is also improved. The Remote Traffic Microwave Sensor was installed and traffic counts made over four weeks. The microwave sensor generally counted lower than the traffic loops. Potential errors for various traffic conditions for both the inductive loops and the microwave sensor were identified and analyzed. Although the counts differ, the microwave provide reasonable detection for the extension and call functions. This study did not look at long term performance or cost benefits of the detector.
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