WORLDKINGS - On This Day - August 03, 2022 - Traffic lights installed at Piccadilly Circus, London in 1926

01-08-2022

(Worldkings.org) The first traffic signal was invented by J P Knight, a railway signalling engineer. It was installed outside the Houses of Parliament in 1868 and looked like any railway signal of the time, with waving semaphore arms and red-green lamps, operated by gas, for night use.