On the Colorado CDL General Knowledge test, on a long downgrade, the proper technique for controlling speed is:

1. Apply the brakes continuously with steady pressure to maintain a safe speed
2. Use the "snub braking" technique: apply brakes firmly to slow 5 mph below target speed, release brakes, and repeat
3. Coast in neutral to save fuel and let the vehicle speed up naturally
4. Ride the brakes lightly throughout the entire downgrade