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Drivers who want to drive combination vehicles must pass the combination vehicles test. The Colorado CDL combination test consists of 20 questions, and you'll need at least 16 correct answers to pass (80%). The test covers the combination vehicles section of the Colorado CDL Manual. Take this practice test now to prepare for the actual CO CDL combination test!
1. An Anti-lock Braking System (ABS):
keeps your wheels from locking up when you brake hard.
always shortens your stopping distance.
lets you drive faster.
increases your normal braking capability.
2. You are driving a heavy vehicle with a manual transmission, and you have to stop on the shoulder while driving on an uphill grade. When putting your vehicle back in motion up the grade, you should:
use the parking brake to hold the vehicle until the clutch engages.
partly engage the clutch before you take your right foot off the brake.
shift down to a speed that you can control without using the brakes.
keep the clutch slipping while slowly accelerating.
3. If you are driving a 30 foot vehicle at 35 mph, you should leave at least _______ between your vehicle and the vehicle in front of you.
3 seconds
1 seconds
4 seconds
2 seconds
4. If you let air out of hot tires:
air pressure will increases, causing the tires to blow out.
as the tire cools, the air pressure will be too low.
the tires will cool off much sooner.
None of the above.
5. When approaching a vehicle with a distracted driver, you should:
quickly pass the vehicle.
sound your horn.
change lanes quickly.
maintain your safe following distance.
6. Which of these is NOT part of the basic method for shifting up?
Release the clutch and press the accelerator at the same time.
Push in the clutch and shift to the higher gear at the same time.
Accelerate while pressing the clutch and turn toward the driver's side.
Release the accelerator, push in the clutch and shift to neutral at the same time.
7. When backing a trailer, if you turn the wheel left:
the cab will go right and the trailer will go left.
the cab and the trailer will go right.
the cab will go left and the trailer will go right.
the cab and the trailer will go left.
8. The two most important things that a driver can do to prevent a rollover when driving a combination vehicle are:
Keeping cargo near the center of the vehicle and driving slowly on turns
Keeping cargo near the ground and driving slowly on the highway
Driving slowly around turns and keeping the cargo as close to the ground as possible
Keeping cargo near center of vehicle and driving slowly on the highway
9. You must check that all shut-off valves are in the open position except the ones:
on the first trailer in a set of triples.
on the middle trailer of a set of triples.
on the first trailer in a set of doubles.
at the back of the last trailer.
10. Antifreeze:
helps the engine under hot conditions as well as cold conditions.
helps the engine only under hot conditions.
helps the engine only when the temperature is below freezing.
doesn't help the engine in any way.
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CDL Combination Test (CO)

Number of questions: 20
Correct answers to pass:16
Passing score:80%
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