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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 inspecting the coupling, how much space should there be between the upper and the lower fifth-wheel?
It depends on the trailer
½ inch
2. For safe handling, the heaviest trailer should be:
the second trailer in a triple.
behind the tractor.
the last trailer.
3. Before connecting the converter dolly to the rear trailer, make sure that:
the kingpin rests on the fifth-wheel.
the shut-off valves at the rear of the first trailer are open.
the trailer height is slightly lower than the center of the fifth-wheel.
4. What is the most important reason to inspect your vehicle?
Your safety and that of other road users.
Saving money by preventing costly repairs.
Vehicle inspection is required by federal and state laws.
5. What is the minimum tread depth for tires other than front tires?
2/32 inch
8/32 inch
4/32 inch
6. To start moving without rolling back, you should:
put on the parking brake whenever necessary.
partly engage the clutch before you take your right foot off the brake.
All of the above.
7. To avoid becoming an aggressive driver you should:
give other drivers your full attention.
give other drivers the benefit of the doubt.
make gestures to other drivers.
8. If an aggressive driver is involved in an accident down the road, you should:
try to get their vehicle to the side of the road.
stop a safe distance from the accident scene, wait for the police and report the behavior you witnessed.
confront the aggressive driver.
9. You must have at least 4/32 inch tread depth in every major groove on front tires and at least ___ inch on other tires.
10. Which of the following is not a sign of fatigue?
Frequent blinking
Rubbing eyes
Keeping a steady speed
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MI CDL Doubles Triples Test

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