Active-infrared overhead vehicle sensor

An active-infrared overhead vehicle sensor capable of detecting vehicle (moving or stationary) presence, classifying type of vehicle, and measuring vehicle speed is described. The results of tests conducted at a street intersection in Orange County, Florida are presented. The test results demonstrate that the sensor reliably (99.4%) detects vehicles including cars, trucks, buses, and motorcycles and measures their speed to within /spl plusmn/1 mi/h (1.6 km/h) at speeds up to at least 50 mi/h (80 km/h).<
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