In relation to downshifting for a long downhill grade, which statement is true?

Downshifting during a long downhill grade is an important technique used to help control the speed of a heavy vehicle. When a driver downshifts, they engage a lower gear which allows the engine to use compression and friction to assist in slowing down the vehicle.

As the vehicle descends, the engine’s compression becomes more effective at managing speed, reducing the reliance on the brakes alone. This is crucial because prolonged braking can lead to brake fade, a condition where brakes overheat and become less effective. By downshifting, the driver utilizes the engine to help maintain a safe speed, thereby enhancing safety and improving overall control while descending a hill.

This technique is fundamental to safe driving practices in large vehicles, especially in mountainous or hilly regions where maintaining control over speed is vital.