Traffic signal lamps are divided into: motor vehicle signal lamps, non motor vehicle signal lamps, crosswalk signal lamps, direction indicator lamps (arrow signal lamps), lane signal lamps, flashing warning signal lamps, and road and railway intersection signal lamps.

Traffic signal light is the signal light to direct traffic operation, which is generally composed of red light, green light and yellow light. A red light means no passage, a green light means permission, and a yellow light means warning.