What does a solid yellow traffic signal indicate?

A solid yellow traffic signal indicates that the light is about to change to red. This means that drivers should prepare to stop if it is safe to do so, as once the light turns red, they must yield to any incoming traffic or pedestrians. The yellow light serves as a warning to give drivers a chance to make a decision: either to slow down and stop or, if they are too close to the intersection to stop safely, to proceed with caution.

The response to the light is essential for maintaining safety on the road. It is not a signal to speed up; rather, it indicates the need for increased awareness and readiness to stop.