Abstract
Signal control strategies are implemented at the junction by the traffic signal controller which may be isolated (stand alone) or linked either locally to one or more adjacent junctions or, in the case of Urban Traffic Control, to a central computer which controls all the traffic signals. Recently manufactured signal controllers use electronic timing to determine the length of the signal stages and electromechanical interlocking relays to switch the signals on and off in the specified sequence. Signal timings can be adjusted according to vehicle detection, remote computers (UTC) or nearby linked controllers, or varied according to time of day.
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