What type of warning does a yellow arrow provide to drivers?

A yellow arrow serves as a warning to drivers that the signal is about to change, informing them that they should prepare to stop if they are approaching the intersection. When a yellow arrow is illuminated, it typically signals that the drivers must yield to pedestrians and that the allowed turning movement may soon be restricted, requiring them to be cautious and consider stopping to avoid running a red light. This crucial information helps drivers navigate intersections safely by urging them to be alert to changing conditions.

The other choices do not accurately reflect the purpose of a yellow arrow. For example, a signal for caution in construction zones pertains to construction signs rather than traffic signals. Warnings about ending turn regulations are not standardly indicated by a yellow arrow. Similarly, while pedestrian crossings and cyclist warnings are important, they are represented by different signs or signals, rather than a yellow arrow.