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English definition of “traffic light”

traffic light

noun [C usually plural] uk   us  
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 from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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