Which technique should be used to control speed on a long, steep downgrade?
Correct answer: C – Use a proper low gear, brake to about 5 mph below the safe speed, release, and repeat
Select the proper low gear before descending and use engine braking as the principal method of controlling speed. When the vehicle reaches its safe speed, apply the service brakes firmly enough to produce a definite slowdown. Release them at about 5 mph below the safe speed, allow speed to rise, and repeat the cycle.
Source: Maine Commercial Driver License Manual — § 2.16.4, “Proper Braking Technique”


