| 摘要 |
Sensors are positioned adjacent a roadway. Such sensors conveniently comprise pressure switches connected to two speed hoses to be run over as in a traffic counter. Alternately, photo-optical, acoustical, or magnetic field sensors can be used. The sensors are spaced a predetermined distance apart in the direction of travel, and provide information to a logic system to measure the speed of vehicles traveling along the roadway. The logic system is connected to a simple readout sign displayed for observation by drivers of vehicles along such roadway, which sign indicates whether a vehicle is traveling at a proper rate, or too fast or too slow, or too close to a preceding vehicle. A modified motion picture camera is provided adjacent the roadway to film a vehicle that is moving too rapidly, and a modified film editing device is provided for counting the frames exposed, and thereby to determine the speed of such vehicle. This latter device preferably reads out direct in miles per hour.
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