a tall post with three lights in a row red, yellow, and green lights a sign or symbol associated with the light a button that can be used to change the light a timer or countdown mechanism a sensor to detect when cars are present
traffic light which is a tall post with three lights in a row traffic light which has red, yellow, and green lights traffic light which is a sign or symbol associated with the light traffic light which is a button that can be used to change the light traffic light which is a timer or countdown mechanism traffic light which is a sensor to detect when cars are present