What does a yellow arrow signal to drivers?

A yellow arrow signals to drivers that the traffic light is about to change from green to red, indicating that they should prepare to stop if they are able to do so safely. It serves as a warning that they need to proceed with caution and to be aware that the right of way will soon change.

This information is essential for maintaining safety at intersections, as it allows drivers to make informed decisions about whether to continue through the intersection or to stop. The presence of a yellow arrow is a critical signal as it helps to manage the flow of traffic and prevent accidents when lights change. Understanding this aspect of traffic signals contributes to overall roadway safety and the effectiveness of traffic management systems.