Question

where do we see the traffic lights

Answer 1

we see the traffic lights on the highway

Answer 2

HERE IS ANSWER↓↓↓

An electric traffic light was developed in 1912 by Lester Wire, a policeman in Salt Lake City, Utah, who also used red-green lights. On 5 August 1914, the American Traffic Signal Company installed a traffic signal system on the corner of East 105th Street and Euclid Avenue in Cleveland, Ohio.