Traffic lights (or traffic signals) are lights used to control the movement of traffic.
They are placed at road intersections and crossings. The different colors of lights tell drivers what to do.
In South Africa, they call them robots.
Traffic lights change their colors in the same order every time. In most English-speaking countries, traffic lights usually change in this order:
Lester Wire was credited with the invention of the electric traffic light in 1912 in Salt Lake City, Utah. Garrett Morgan, an African-American inventor, also developed a traffic signaling system, and was one of the first people to get a patent for a traffic light.
William Potts, a police officer, invented the first traffic light with three colors.
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