Question

Books:


Traffic signals :​

Answer 1

Explanation:

Traffic lights, traffic signals, stoplights or robots [1] are signalling devices positioned at road intersections, pedestrian crossings, and other locations to control flows of traffic.[2]

The world's first traffic light was a manually operated gas-lit signal installed in London in December 1868. It exploded less than a month after it was implemented, injuring its policeman operator.[3] Earnest Sirrine from Chicago patented the first automated traffic control system in 1910. It used the words "STOP" and "PROCEED", although neither word was