Final answer:
To control your speed on a steep downgrade, you should use a lower gear to utilize the engine's braking power and prevent the brakes from overheating.
Step-by-step explanation:
To control your speed on a steep downgrade, you should use a lower gear.
When you use a lower gear while going downhill, it helps to slow down the vehicle by utilizing the engine's braking power.
This can help prevent the brakes from overheating and ensure better control of the vehicle.