What is the significance of using lower gears while driving downhill?

Using lower gears while driving downhill is crucial for safely controlling vehicle speed. When you shift to a lower gear, it allows the engine to help slow the vehicle down through engine braking. This means that instead of relying solely on the brakes to control your speed, the engine's resistance helps maintain a safe speed on descents. This is particularly important because relying only on brakes can lead to overheating and possible brake failure, especially on steep hills.

Lower gears make use of the engine's natural resistance, which provides greater control and stability, reducing the risk of losing traction and maintaining a safer descent. This practice is essential for truck drivers and anyone operating a vehicle that could be heavily loaded or carrying a trailer, as it enhances safety on descents and prevents accidents caused by excessive speed.