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traffic light

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noun
  1. a set of electrically operated signal lights used to direct or control traffic at intersections.
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Origin of traffic light

First recorded in 1925–30
Also called stoplight, traffic signal, traffic control signal.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for traffic light

traffic light

traffic signal

noun
  1. 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
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012