A red traffic light means:

A red traffic light indicates that you must stop and wait behind the stop line. This signal is universally recognized as a directive to halt all movement in order to ensure the safety of all road users. Stopping at a red light helps to prevent accidents that may occur if vehicles were to proceed without stopping, particularly at intersections where other vehicles or pedestrians may be crossing the road.

Waiting behind the stop line is crucial, as it ensures that vehicles do not encroach upon the crosswalk or intersection, allowing for safe passage for pedestrians and other road users. This rule is an essential aspect of road safety and traffic regulations. Other options imply actions that would violate the fundamental rules of traffic lights and may lead to dangerous situations on the road.