What does a yellow traffic light indicate?

Answer: B — Prepare to stop

A yellow traffic light indicates that the signal is about to change to red, and drivers should prepare to stop. It serves as a warning that the light is transitioning, giving motorists time to react appropriately. The primary message is one of caution, so drivers are encouraged to slow down and stop if it is safe to do so. This signal helps to prevent accidents by alerting drivers to the need to reduce speed and prepare to yield to oncoming traffic or pedestrians once the light turns red. Thus, recognizing the significance of a yellow light is crucial for maintaining safety on the road.