The signal light is probably the most easily recognized traffic control device. At a busy intersection in alarge city, a traffic signal may control the movement of more than 100,000 vehicles per day. More than 60 percent of all miles driven each year are on roadways controlled by traffic signals.Traffic signals direct stream of vehicles and pedestrians when to go, stop or proceed with caution. Thesignals increase the traffic-handling capacity of most intersections. They can work independently on timers, or connectto a computer-controlled system, traffic detectors are several intersections. In a computerized system, trafficdetector are placed. at several locations – generally in the pavement. A computer continously scans the trafficinformation from each detector. The computer then selects the best timing for each signal to reduce trafficcongestions and minimize held-up
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