What does a red arrow at an intersection indicate?

A red arrow at an intersection clearly indicates that turning traffic must stop. This signal functions similarly to a red traffic light, but specifically applies to vehicles intending to make a turn. It directs drivers to stop and wait until they receive a green arrow or a green light, which would authorize them to proceed with the turn safely.

The purpose of this signal is to enhance safety at intersections by ensuring that vehicles do not turn when it is unsafe to do so, which can prevent accidents. It is crucial for drivers to heed this signal as disregarding it could lead to violations and potential collisions with oncoming traffic or pedestrians.

Other options may suggest actions that contradict the meaning of the red arrow, such as proceeding with caution or signaling, which would not apply when a red arrow is showing. Thus, understanding the definitive instruction given by the red arrow helps maintain safety and compliance with traffic laws.