What does a red traffic light mean?

A red traffic light indicates that you must come to a complete stop at the intersection or at the designated stopping point, such as a stop line or crosswalk. This signal means that it is illegal to proceed through the intersection until the light turns green. The purpose of the red light is to control traffic flow and ensure safety at intersections, preventing collisions and allowing other vehicles or pedestrians the right of way.

While options like proceeding with caution or preparing to stop may seem relevant in other contexts, they do not capture the definitive action required when facing a red light. Additionally, yielding to pedestrians is important at crosswalks but is a separate rule that applies in conjunction with traffic signals rather than serving as the primary meaning of a red light. Thus, the requirement to stop is the key instruction provided by a red traffic light, making it the correct interpretation of this signal.