What does a Traffic Control Signal do?

A Traffic Control Signal is primarily designed to manage and regulate the flow of vehicular and pedestrian traffic at intersections or along roadways. It accomplishes this by alternately displaying signals that indicate when vehicles must stop (red light) and when they may proceed (green light). This helps ensure safe and orderly movement on the roads, reducing the potential for accidents or confusion among drivers.

While the other options address various aspects of traffic management, none accurately capture the primary function of Traffic Control Signals. Directing traffic only during certain hours might pertain more to signs or signals that are activated based on time of day rather than the continuous operation of a traffic signal. Acting as a warning for oncoming trains is a specific role of railway signaling systems, which have different mechanisms altogether. Lastly, displaying speed limits is typically done through road signs rather than traffic control signals, which focus on directing actions rather than indicating speed. Therefore, the correct option highlights the essential role of traffic control signals in facilitating safe and efficient traffic flow.