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English definition of “traffic light”

traffic light

noun [C usually plural]    
A2 one of a set of red , yellow , and green lights that control the movement of vehicles , usually at a point where two or more roads join : The police pulled him over for failing to stop at a red traffic light . Turn left at the traffic lights . The traffic lights turned green as we approached the junction .Lights, signs and markings on roads
(Definition of traffic light noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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