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The first electric traffic signal is installed in Cleveland, Ohio, at the intersection of Euclid Avenue and East 105th Street, by the American Traffic Signal Company. It was manually operated by a nearby police officer and It had two light colors, red and green. It also had a manual buzzer to announce the change from one color to the other. There had been previously reported traffic light installations but this one is believed to be the first permanently installed electric traffic light. Detroit and New York added the yellow between red and green in 1920. More