When should a retarding device be utilized in heavy vehicle operation?

Using a retarding device at higher engine RPM and lower vehicle speed is beneficial because it allows for optimal engine performance and braking effectiveness. Retarding devices, such as engine brakes or exhaust brakes, engage the engine's internal components to help slow down the vehicle without relying solely on traditional brake systems. This can reduce the wear on the brake components and provide smooth deceleration.

Driving at higher RPMs permits the engine's braking system to create more resistance, aiding in reducing vehicle speed, especially when additional braking power is needed. In scenarios where the vehicle is moving slowly, using the retarder can help control the vehicle effectively while complementing the regular braking system.

Utilizing a retarding device properly can enhance safety by preventing overheating of the conventional brakes and ensuring that the vehicle remains under control at various speeds. This knowledge is crucial for drivers of heavy vehicles to maintain their vehicle effectively, especially in varying field conditions.