When going down a steep hill, what should you do?

Shifting to a lower gear when going down a steep hill is important for maintaining control of the vehicle. By selecting a lower gear, the engine is able to assist with braking through engine braking, which reduces the reliance on the brakes alone. This technique helps to prevent the brakes from overheating due to excessive use, allowing for a safer descent. Engine braking provides additional resistance that helps slow the vehicle down without the risk of losing control that can occur when solely using the brake pedal for prolonged periods.

The other options suggest methods that could lead to decreased vehicle control or increased brake wear. Maintaining the same gear may not provide enough braking force, while shifting to a higher gear can cause the vehicle to gain speed unexpectedly. Constant use of the brakes can lead to brake fade, which can reduce the effectiveness of braking over time. Therefore, shifting to a lower gear is the safest and most effective method for descending steep hills.