United States Department of Transportation
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Detector Accuracy and Reliability Testing for Wrong-Way Movements on Elevated Roadways
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1993-12-01
[PDF-2.03 MB]
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Edition:Interim: September 1991 - August 1993
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Abstract:The study evaluated six detection technologies (surface-mounted inductive loop, piezoelectric, infrared, microloop, microwave and ultrasonic) for counting accuracy and directional movement accuracy on a one-lane elevated roadway. A video tape system recorded actual traffic volumes. These counts were compared to detector data recorded in a computer file. The results cast doubt on the accuracy of any single detection technology for meeting the needs of real-time freeway management. The counting accuracy of the ultrasonic, surface-mounted inductive loop and infrared detectors was just over 80 percent. Directional movement accuracy was 86% for the ultrasonic system, 61 % for surface-mounted inductive loop system, and 47% for the uncorrected infrared detection system. The microwave and Micro loop systems failed completely, and a piezoelectric system manufacturing error resulted in it being nonfunctional. The detectors were also tested after a period of six months. Thus, the researchers concluded that the level of accuracy needed for wrong-way movement detection will require two or more independent systems.
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