first electric traffic signal system!! The world’s first electric traffic signal is put into place on the corner of Euclid Avenue and East 105th Street in Cleveland, Ohio, on 5 August in 1914.

Traffic lights, also known as traffic signals, traffic lamps, traffic semaphore, signal lights, stop lights and robots,and also known technically as traffic control signals are signalling devices positioned at road intersections, pedestrian crossings and other locations to control conflicting flows of traffic. The first manually operated gas-lit traffic light was installed in 1868 in London, though it was short-lived due to explosion.

On 9 December 1868, the first, non-electric, gas-lit traffic lights were installed outside the Houses of Parliament in London to control the traffic in Bridge Street, Great George Street and Parliament Street. The 1st electrical traffic lights were in Princess Sq Wolverhampton & were in the centre of the cross road junction

They were promoted by the railway engineer J. P. Knight and constructed by the railway signal engineers of Saxby & Farmer. The design combined three semaphore arms with red and green gas lamps for night-time use, on a pillar, operated by a police constable. The gas lantern was manually turned by a traffic police officer, with a lever at its base so that the appropriate light faced traffic.