first experimental system of traffic lights in England (born in 1927)

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Traffic lights, also known as traffic signals, traffic lamps, 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 competing flows of traffic. Traffic lights were first installed in 1868 in London and are now used all over the world.Traffic lights alternate the right of way accorded to road users by displaying lights of a standard color (red, yellow, and green) following a universal color code. In the typical sequence of color phases: the green light allows traffic to proceed in the direction denoted, if it is safe to do so the yellow light denoting prepare to stop short of the intersection, if it is safe to do so the red signal prohibits any traffic from proceeding↑ ↑ ↑

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