What milestone was achieved by James Hoge's creation in Cleveland in 1914?

Answer

The first electric traffic signal

James Hoge created the first electric traffic signal, which featured red and green lights, installed in Cleveland, Ohio, in 1914, successfully integrating electricity into the signaling process.

What milestone was achieved by James Hoge's creation in Cleveland in 1914?
inventorTransportationSignalautomationtraffic light