On what specific date was the first automated electric traffic signal system installed in the US?

Answer

August 5, 1914

The technological shift to electrical automation for traffic control occurred on August 5, 1914, when the signal was activated in Cleveland.

On what specific date was the first automated electric traffic signal system installed in the US?

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Invention of the traffic light by Garrett Morgan was in Cleveland in 1923

inventionHistorySignaltraffictraffic light