History of the Traffic Signal
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…alternately raised a red glass and a green glass.
Electric traffic lights were installed for the first time in 1914 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 Street's turn to go.
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