What does a yellow light on a traffic signal indicate?

A yellow light on a traffic signal serves as a warning that the light is about to change to red. It indicates that drivers should prepare to stop if it is safe to do so. This helps prevent accidents that could occur if a driver tries to rush through the intersection just as the light changes. The intention is to promote safe driving practices by giving motorists a heads-up to be cautious and evaluate their stopping distance. It's essential for drivers to recognize that the yellow light is not an invitation to speed up but rather a crucial signal to fully assess the situation and safely come to a stop if possible.