What does a red traffic light mean?

A red traffic light signifies that vehicles must come to a complete stop. This is a critical rule designed to ensure safety at intersections and prevent collisions. When a driver encounters a red light, they are required to halt their vehicle behind the stop line or crosswalk, allowing for cross traffic and pedestrians to move safely through the intersection.

The other options might suggest alternative actions, but they do not align with the universal traffic rules regarding red lights. For instance, proceeding with caution or yielding to traffic does not apply when a red light is present, as these actions could lead to accidents or violations. Waiting for a green light is a consequence of stopping at a red light, but the act of stopping itself is the fundamental response required by traffic law.