What is the purpose of the yellow traffic light?

The purpose of the yellow traffic light is to signal that the light is about to change to red. This warning allows drivers to prepare for the upcoming change, giving them the opportunity to stop safely if they are approaching the intersection. The yellow light serves as an alert that they need to decide whether to proceed through the intersection or come to a stop, depending on their distance from the light and their speed. It encourages cautious driving behavior, ensuring that drivers are aware of the need to react to the traffic signal before it becomes red, which governs the regulation of traffic flow and helps prevent accidents at intersections.