First electric traffic signal

The first electric traffic signal was installed Aug. 5, 1914, at the corner of Euclid Avenue and East 105th Street in Cleveland, according to the History Channel's website, history.com.

Based on a design by James Hoge, who received the U.S. patent for his device in 1918, the "Municipal Traffic Control System" comprised four pairs of red and green lights that served as stop-and-go indicators, each mounted on a corner post and operated by a switch inside a control booth, configured to make conflicting signals impossible.

This invention brought to an end a growing problem in the early days of automobiles, when pedestrians, bicycles, horses and streetcars all converged on the same roadways, the History Channel states.

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