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TRAFFIC LIGHTS
Fixed-time traffic lights were invented in the United States and introduced in New York in 1918. Eight years later the United States set up a Committee on Uniform Traffic Control. The purpose of traffic lights is to control the flow of traffic, determine the right of way at intersections and give greater safety to drivers. By linking successive traffic signals together a progressive movement through the streets can be provided. Traffic lights were used for the first time in Britain at Wolverhampton, Staffordshire, in 1928. Sixty years earlier the London police had introduced a system of traffic control signals based on the swinging arms of the semaphore.
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