What does a yellow traffic light indicate?

A yellow traffic light serves as a warning that the signal is about to change to red. This means drivers should prepare to stop safely unless they are too close to the intersection to stop safely. The purpose of the yellow light is to provide a transitional phase between the green and red signals, alerting drivers that they should be cautious and prepare for the possibility of a stop. This is important for maintaining safety at intersections, as approaching vehicles may not have enough time to clear the intersection before the light turns red. The yellow light is an essential part of traffic signal timing, designed to prevent accidents and facilitate smooth traffic flow.