instrument for directing traffic via changing lights, automatic mechanism in the form of a lantern
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Traffic signal Definition from Language, Idioms & Slang Dictionaries & Glossaries
traffic signal
n : a visual signal to control the flow of traffic at intersections [syn: traffic light, stoplight]
Noun
1. a visual signal to control the flow of traffic at intersections
(synonym) traffic light, stoplight
(hypernym) light
(hyponym) green light, go-ahead
Traffic signal Definition from Encyclopedia Dictionaries & Glossaries
Traffic lights, which may also be known as stoplights, traffic lamps, traffic signals, signal lights, robots or semaphore, are signalling devices positioned at road intersections, pedestrian crossings and other locations to control competing flows of traffic. Traffic lights were first installed in 1868 in London, and today are installed in most cities around the world. Traffic lights alternate the right of way of road users by displaying lights of a standard colour (red, yellow/amber, and green), using a universal color code (and a precise sequence to enable comprehension by those who are color blind).
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