traffic light

noun
a set of electrically operated signal lights used to direct or control traffic at intersections.
Also called stoplight, traffic signal, traffic control signal.


Origin:
1925–30

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
traffic light or traffic signal
 
n
one of a set of coloured lights placed at crossroads, junctions, etc, to control the flow of traffic. A red light indicates that traffic must stop and a green light that it may go: usually an amber warning light is added between the red and the green
 
traffic signal or traffic signal
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
They do this at traffic light crossings, waiting patiently with human
  pedestrians for a red light before retrieving their prize.
Whenever they came to a traffic light, it turned green, as if by magic.
The obsession with so-called traffic light nutrition labelling is a case in
  point.
He watched a traffic light swinging high above the street.
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