Final answer:
When approaching a downward slope while driving, it is important to use low gear or engine braking to control the speed of the vehicle.
Step-by-step explanation:
When approaching a downward slope while driving, it is important to use low gear or engine braking to control the speed of the vehicle. This technique helps prevent the brakes from overheating and losing effectiveness. Engine braking involves using the slowing forces of the engine in a lower gear to slow down the vehicle, rather than relying solely on the brakes.