What should a driver avoid doing when driving downhill?

When driving downhill, placing the transmission in neutral to adjust target speed is something that should be avoided. This practice can result in a loss of vehicle control. When the vehicle is in neutral, the driver cannot effectively use the engine braking system, which is crucial for maintaining speed and stability on a downhill slope. Engine braking helps to slow the vehicle down without relying solely on the brakes, reducing the risk of brake overheating and failure. Additionally, being in neutral can delay the driver's reaction to sudden obstacles or changes in traffic conditions, which could compromise safety.

In contrast, maintaining a slower speed, using the brake to control speed (when necessary), and shifting gears appropriately are all techniques that help ensure the vehicle remains under control while downhill driving.