Final answer:
Traffic control devices ensure smooth flow of traffic, provide information to drivers, and regulate the movement of vehicles.
Step-by-step explanation:
Traffic control devices have multiple functions. They ensure the smooth flow of traffic, provide information to drivers, and regulate the movement of vehicles. These devices include traffic signals, road signs, and pavement markings. Traffic signals help control the flow of vehicles at intersections, while road signs provide information about speed limits, directions, and potential hazards. Pavement markings, such as lines and symbols, help guide drivers and regulate traffic movement.