English

Definition of traffic light noun from the Oxford Advanced Learner's Dictionary

 

traffic light

 noun
noun
BrE
 
; NAmE
 
[countable] (also traffic lights [plural]) (North American English also stoplights [plural]) Features of roads, Controlling traffic
 
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a signal that controls the traffic on a road, by means of red, orange and green lights that show when you must stop and when you can go Turn left at the traffic lights. See related entries: Features of roads, Controlling trafficExtra examples The traffic lights weren’t working. There are temporary traffic lights because of the roadworks. Turn left at the third set of traffic lights.
See the Oxford Advanced American Dictionary entry: traffic light