What does it mean when the traffic light turns red?

When the traffic light turns red, it signifies that drivers must stop and wait for the light to turn green before proceeding. This rule is fundamental to traffic safety and helps control the flow of vehicles and pedestrians at intersections. Stopping at a red light ensures that drivers yield the right of way to other road users, particularly pedestrians who may be crossing the street.

The other options do not imply the required action for a red light. For example, preparing to turn right may be appropriate at certain intersections under specific conditions, but it does not apply universally to all red lights. Similarly, yielding only to pedestrians is not sufficient because a red light requires a complete stop regardless of whether pedestrians are present. Proceeding with caution is not appropriate either, as it suggests moving forward when the light is red, which is contrary to traffic laws and could lead to dangerous situations. Therefore, recognizing a red light as a signal to stop is essential for safe driving practices.