Traffic lights, also known as traffic signals, traffic lamps, signal lights, robots in South Africa and, in the past, semaphores, 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/amber, 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/amber light denoting prepare to stop short of the intersection, if it...
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