What does a yellow arrow notify drivers about the traffic signal?

A yellow arrow serves as a warning to drivers that the protection provided by the green arrow is about to end. This means that drivers should prepare to stop because the signal is about to change to a red light or a more restrictive signal. The purpose of the yellow arrow is to ensure that drivers are aware that they may no longer have the right of way soon, which allows them to reduce speed and make safe driving decisions as they approach the intersection. The indication is fundamentally about adjusting driver behavior in anticipation of the upcoming change in traffic signals to maintain safety.

In this scenario, the other options do not correctly represent the meaning of a yellow arrow. For instance, it does not indicate a malfunctioning signal or suggest that the green arrow will soon turn yellow directly. Additionally, it does not grant drivers permission to turn without stopping, as that would misinterpret the warning nature of the yellow arrow.