What does a red arrow at an intersection indicate?

A red arrow at an intersection signifies that turning traffic must stop. This traffic signal is similar to a red traffic light, but it specifically applies to drivers intending to turn in the direction of the arrow. The purpose of the red arrow is to ensure the safety of pedestrians and oncoming traffic by prohibiting turns until the signal changes.

In contrast, a green arrow would indicate that a driver can turn in the direction of the arrow, while a yellow arrow warns that the red arrow is about to appear, indicating that drivers should prepare to stop. The other options do not accurately describe the role of the red arrow in regulating traffic at intersections, as they either suggest incorrect traffic behavior or misunderstand the signal's intention.