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Safely pulling double and triple trailers requires knowledge and skill. If you want to pull double or triple trailers, you must add the Doubles/Triples (T) endorsement to your Class A CDL. The Michigan doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The MI CDL doubles triples test covers the following sections of the Michigan CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this MI CDL practice test now to prepare for the actual test!
1. To reduce driver distraction, you should do all of the following except:
Pre-program radio stations
Eat while driving.
Plan your route before driving
2. When driving double and triple trailers, drivers should:
allow more following distance.
steer gently and go slowly around corners.
All of the above.
3. An ABS system:
helps increase a vehicle's stopping power.
is a safety anti-skid braking system.
requires a change in the way you brake.
4. The application pressure gauge:
protects the tank and the rest of the system from too much pressure.
tells you how much pressure is in the air tanks.
shows how much air pressure is being applied to the brakes.
5. As you approach off ramps and on ramps, remember:
that the posted speed limit may be safe for automobiles, but may not be safe for larger vehicles.
that braking and turning at the same time can be a dangerous.
All of the above.
6. If a vehicle is equipped with ABS, when you start the engine:
the ABS indicator light on the dash should come on and then turn off.
the wheels will lock up.
the spring brakes will come on.
7. Which of the following statements about backing heavy vehicles is true?
You should avoid backing whenever you can.
Back to the right side so that you can see better.
Always back as quickly as possible.
8. Engine oil pressure should come up to normal within _________ after the engine is started.
two minutes
five minutes
9. Empty trucks require _____ stopping distances because empty vehicles have ______ traction.
less; more
greater; more
greater; less
10. A bridge formula permits:
less maximum axle weight for axles that are close together.
more maximum axle weight for axles that are closer together.
less maximum axle weight for axles that are far apart.
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MI Doubles Triples CDL Test

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