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This article is about a traffic control device. For the type of political coalition, see Traffic light coalition.
"Traffic Signal" redirects here. For the 2007 Bollywood film, see Traffic Signal (film).

The traffic light, also known as traffic signal, stop light, traffic lamp, stop-and-go lights, robot or semaphore, is a signaling device positioned at a road intersection, pedestrian crossing, or other location. Its purpose is to indicate, using a series of colours (Red - Amber - Green), the correct moment to stop, drive, ride or walk, using a universal colour code (and a precise sequence, for those who are colour blind).