What does a yellow traffic light indicate?

A yellow traffic light indicates that drivers should proceed with caution. This warning signals that the light is about to change to red, and therefore, drivers need to be prepared to stop if it’s safe to do so. It’s essential to slow down and evaluate the traffic conditions. Caution is necessary because while some drivers may choose to stop at this light, others may have already entered the intersection, highlighting the need for vigilance.

The other options do not accurately convey the situation a yellow light represents. It's not a mandate to stop immediately; instead, it’s a prompt to be aware of the changing signal and adjust driving behavior accordingly. A stop might be required in certain situations, but it’s not universally mandated with a yellow light. Additionally, a yellow light is not a legal warning or an indication that a green light is coming; instead, it’s an alert that immediate attention is needed to ensure safety on the road.