第3个回答 2008-01-05
A traffic light, also known as a traffic signal, stop light, traffic lamp, stop-and-go lights, robot or semaphore
reference data
A traffic light, also known as a 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 in order to indicate which specific movement to drive, ride or walk is assigned the right-of-way at a given moment, using a universal color code (and a precise sequence, for those that are color blind).