What does a yellow light at a traffic light indicate?

A yellow light at a traffic signal serves as a warning that the light is about to change to red. It indicates that drivers should be prepared to stop if it is safe to do so. The emphasis is on safety; thus, if stopping can be done without risking a collision, that is the appropriate action. This light encourages drivers to react promptly to the changing traffic condition.

It is important for drivers to understand that the yellow light is not an invitation to accelerate or ignore the signal. Rather, it alerts them to a need for caution and readiness to stop, which can prevent accidents and ensure compliance with traffic laws.