What does a solid yellow signal light indicate?

A solid yellow signal light indicates that the traffic light is about to change to red, signaling drivers to prepare to stop. The purpose of the yellow light is to provide a warning that the green light is ending, allowing enough time for vehicles to safely clear the intersection if they are already in it, while also giving those approaching the intersection time to stop if it's safe to do so. This warning is crucial for maintaining safety and traffic flow, ensuring that drivers are aware of the changing conditions at the intersection.

The other options do not align with the meaning of a solid yellow signal. Speeding up to cross is dangerous and could lead to accidents, as it does not give the driver adequate time to assess the situation if the light changes to red. It is not safe to proceed through the intersection when the light is yellow unless you are already within the intersection. Additionally, turning right at this point is not the direct implication of a solid yellow light; the primary focus should be on when to stop safely.