Final answer:
Traffic signals are devices used to control the flow of traffic at intersections, helping to regulate traffic and improve safety.
Step-by-step explanation:
Traffic signals are devices used to control the flow of traffic at intersections. They are typically composed of three lights: red, yellow, and green. Each light has a specific meaning for drivers:
- Red light: Drivers must stop at the intersection until the light turns green.
- Yellow light: Drivers should prepare to stop, as the light is about to turn red.
- Green light: Drivers can proceed through the intersection if it is clear.
Traffic signals help regulate traffic, improve safety, and reduce the risk of accidents at intersections.