What does a yellow traffic light indicate?

A yellow traffic light serves as a caution signal, signaling that the light is about to change to red. This indicates that drivers should prepare to stop rather than to proceed. It acts as a warning to provide drivers with enough time to react safely — either by stopping if they can do so safely or by clearing the intersection if they are already too close to stop comfortably.

The other options present scenarios that misinterpret the function of the yellow light. It does not indicate that it is safe to proceed; instead, it warns that a stop might be necessary. Speeding up to clear the intersection is dangerous and contradicts the purpose of the yellow light, which aims to prevent accidents by encouraging caution. Additionally, the yellow light does not mean that traffic is halted in both directions; rather, it is a transitional signal for those approaching the intersection.