The world’s first traffic lights were installed near the Houses of Parliament in London in 1868.
They consisted of a semaphore arm and were fitted with red and green gas lamps for night use.
The first electric traffic lights were installed in Cleveland, Ohio, in August 1914. They were invented by Lester Wire in 1912.
The lights were red and green. A warning buzzer sounded when the lights were about to change.
The first patent for a traffic signal in the USA was issued to a Mr Morgan in 1923 (patent #. 1,475,024).
The patent was for a T-shaped pole with arms that was controlled by an electric clock mechanism.
The world’s first 4-way three colour traffic lights were installed in 1920 in Detroit, USA. They were invented by William Potts.
In England the first (experimental) automatic traffic lights were set up in Wolverhampton in 1927.