Truckers' Challenge: How Well Do You Know Big Rigs?Share:FacebookPinterestTwitterMail7. What control do you use to adjust the cruise control speed in a truck?28%Next Correct Incorrect Cruise control speed is adjusted using buttons or switches specifically for that function. 7. What control do you use to adjust the cruise control speed in a truck? Gear lever Steering wheel button Cruise control switch Brake pedal 28%