What does a yellow traffic signal indicate?

A yellow traffic signal serves as a warning that the signal is about to change to red. This alerts drivers that they need to prepare to stop safely before entering the intersection. The purpose of the yellow light is to give drivers a brief opportunity to react to the upcoming change in signal status. While drivers may choose to proceed with caution if they are too close to the intersection to stop safely, the main intent of the yellow light is to signal them to get ready to stop, thereby ensuring traffic flow and safety.

The focus here is not just about stopping, but also on the need for reduced speed and increased alertness as the transition from green to red is imminent. Therefore, preparing to stop is the most accurate interpretation of what a yellow traffic signal indicates, reflecting the need for caution and vigilance as situations at intersections can change rapidly.