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Even during the horse and buggy days, traffic in big cities was often heavy. Police officers had to be stationed full time directing traffic at busy intersections
The world's first traffic light came into being before the automobile was in use, and traffic consisted only of pedestrians, buggies, and wagons. Installed at an intersection in London in 1868, it was a revolving lantern with red and green signals. Red meant stop and green meant caution. The lantern, illuminated by gas, was turned by means of a lever at its base so that the appropriate light faced traffic. On January , 186, this crude traffic light exploded, injuring the policeman who was operating it. Police Officer William Potts of Detroit, Michigan, decided to do something about the problem. The railroads were already utilizing automatic controls. But railroad traffic traveled along parallel lines. Street traffic traveled at right angles. Potts used red, amber, and green railroad lights and about thirty-seven dollars worth of wire and electrical controls to make the world's first traffic light. Within a year, Detroit had installed a total of fifteen of the new automatic lights.
At about the same time, Garrett Morgan of the United States realized the need to control the flow of traffic. A gifted inventor and reportedly the first African American to own an automobile in Cleveland, Ohio, he invented the electric automatic traffic light.
In 1868 the first known traffic light was installed for pedestrians who had to walk across main streets or along tramways in England. This traffic signal was a gas lamp, consisting of a semaphore signal which alternately raised a red glass and a green glass.
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Electric traffic lights were installed for the first time in 114 by the American Traffic Signal Company under the direction of Safety Director Alfred A. Benesch in Cleveland, Ohio at Euclid Ave. and 105th Street. It was had two long crossarms, red and green lights, and buzzers. Two long buzzes signaled Euclid Avenue traffic to proceed, one long buzz meant it was 105th Streets turn to go.
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