Indiana Bureau of Motor Vehicles Permit Practice Test

The primary purpose of traffic signals is to control the movement of traffic. Traffic signals are designed to ensure the safe and orderly flow of vehicles and pedestrians at intersections and crossings. By regulating when vehicles and pedestrians should stop and go, traffic signals help to prevent accidents and reduce congestion. They provide clear instructions to drivers, allowing for efficient turns, stops, and crossings while ensuring that all road users can navigate safely.

Options such as displaying advertisements or providing directions are secondary functionalities that do not align with the main objective of traffic signals, which is safety and traffic management. Similarly, indicating speed limits is not the function of traffic signals but rather of regulatory road signs.