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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. When driving at night, you should use ________ when you can.
emergency flashers
high beams
low beams
2. When the wheels of a trailer lock up, which of the following is most likely to occur?
The trailer will tend to push the towing vehicle sideways (tractor jackknife).
The trailer will the trailer has overturn.
The trailer will tend to swing around (trailer jackknife).
3. Glad hands are:
coupling devices.
warning devices.
securement devices.
4. Doubles and triples:
can't be turned suddenly.
can be turned suddently due to the low center of gravity.
can be stopped suddenly due to their weight.
5. The space under a heavily loaded vehicle can be very small. This can cause problems:
when crossing railroad tracks.
on dirt roads.
All of the above.
6. When coupling double trailers, you can secure the second trailer by:
chocking the wheels.
using the trailer spring brakes.
All of the above.
7. If the air compressor is belt-driven, you should check the air compressor drive belt before each trip. The belt should be:
8. When coupling double trailers, if the second trailer does not have spring brakes, to set the trailer emergency brakes you should:
1. Connect the emergency line 2. Drive the tractor close to the trailer 3. Disconnect the emergency line 4. Charge the trailer air tank.
1. Disconnect the emergency line 2. Drive the tractor close to the trailer 3. Charge the trailer air tank 4. Connect the emergency line.
1. Drive the tractor close to the trailer 2. Connect the emergency line 3. Charge the trailer air tank 4. Disconnect the emergency line.
9. Driving in very hot weather:
can increase tire pressure.
can decrease oil pressure.
should never be done.
10. Which of the following vehicles is most likely to turn over?
3 axle tractor semitrailer
65 ft. conventional double
Triple trailer
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Doubles Triples MI CDL Test

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