What should a driver NOT do when driving downhill?

Answer: D — Place the transmission in neutral to adjust the target speed

When driving downhill, placing the transmission in neutral to adjust the target speed is strongly discouraged. This action can significantly compromise vehicle control and safety. By shifting to neutral, the driver loses the engine braking effect that helps maintain a safe speed. Engine braking, which utilizes the engine's resistance to slow the vehicle, is crucial on downhill slopes, especially when carrying heavy loads, like a school bus. Additionally, being in neutral can lead to an increased reliance on the brakes alone. This can result in overheating and brake fade, as the brakes may become less effective if used continuously without any support from engine braking. Therefore, it is vital for a driver to keep the vehicle in gear while driving downhill to maintain control and ensure a safe descent. In contrast, maintaining target speed with the appropriate gear, approaching downhill at a safe speed, and using appropriate braking techniques are all sound practices that contribute to safe driving on declines. They emphasize the importance of vehicle control, optimal speed management, and effective use of braking systems.