What does a red arrow indicate for the indicated lane of traffic?

A red arrow in traffic signals specifically conveys that drivers cannot proceed in the direction the arrow is pointing. It effectively has the same implications as a circular red light for the lane of traffic indicated by the arrow. This means that vehicles must come to a complete stop and must not make any movement in the direction of the arrow until the signal changes.

The significance of this is rooted in traffic safety, as it helps control the flow of vehicles and pedestrians at intersections. Understanding the function of red arrows is crucial for maintaining safe traffic conditions. Therefore, recognizing that a red arrow means to stop—akin to a red light—is essential knowledge for any driver.