Which gear should you use when driving downhill in a bus?

When driving downhill in a bus, using a lower gear to manage speed is crucial for several reasons. A lower gear provides greater engine braking capability, which helps to control the vehicle's speed without solely relying on the brakes. This is important because excessive use of the brakes can lead to overheating and decreased braking efficiency, increasing the risk of losing control while descending a slope.

By selecting a lower gear, the engine works harder to slow the vehicle down, thereby reducing the need to apply the brakes as frequently. This strategy not only enhances safety but also improves the overall handling of the bus on steep inclines. Additionally, maintaining a manageable speed in a lower gear allows the driver to better react to any obstacles or changes in road conditions that may arise during the descent.

Choosing the highest gear would not provide the necessary control and could lead to excessive speeds, while maintaining the same gear you were in before the downgrade may not adequately account for the increased gravitational force working against you on a decline. Selecting the lowest gear regardless of speed is also not practical, as it may lead to over-revving the engine or unnecessary strain on the drivetrain. Thus, selecting a lower gear is the most effective and safest approach when driving downhill in a bus.