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A traffic control signal (Traffic Signal) is a type of highway traffic signal by which traffic is alternately directed to stop and permitted to proceed
Traffic control signals are described as either pre-timed or traffic-actuated
Under pre-timed control duration of red, green, and yellow intervals are predetermined
Under traffic-actuated control, the duration of green intervals varies according to traffic demands
Traffic control signals are valuable devices for control of vehicle and pedestrian traffic and usually have one or more of the following advantages:
They provide for orderly movement of traffic
They can increase the traffic handling capacity of an intersection
They can reduce the frequency of certain types of accidents, especially the right-angle type
They can be coordinated to provide for continuous or nearly continuous movement of traffic at a definite speed along a given route
They can be used to interrupt heavy traffic at intervals to permit other traffic, vehicular, or pedestrian to cross
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