What should an operator do when approaching a yellow traffic light?

When an operator approaches a yellow traffic light, the appropriate action is to slow down and prepare to stop. A yellow light indicates that the signal is about to change to red, signaling drivers to clear the intersection if they are already in it or to stop safely if they haven't entered yet.

This action prioritizes safety and adherence to traffic laws. By slowing down, the operator ensures they are not caught in the intersection when the light changes to red, which could lead to traffic violations or accidents. This response also allows for proper decision-making on whether to stop or proceed safely, depending on how close they are to the intersection at the time of the light change.

The other choices do not align with safe driving practices. Speeding up could lead to danger as the driver risks entering the intersection at a time when other vehicles may also be reacting to the light change. Proceeding without caution overlooks the potential for unexpected situations, such as pedestrians crossing or vehicles stopping. Turning left without regard for the light would also be unsafe, particularly if oncoming traffic is present or if the turn cannot be completed safely.