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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 a truck with more than 1 trailer, drivers should:
be especially careful in adverse conditions.
allow more following distance.
All of the above.
2. By pushing the trailer air supply control knob in, you:
shut the air off and put on the trailer emergency brakes.
supply the trailer with air.
supply the tires with air.
3. The earliest way to recognize that your trailer has started to skid is:
by checking your mirrors.
by checking the jackknife sensor.
by releasing the brakes.
4. You are driving a modern truck with a manual transmission. When going down a hill you should usually:
use the same gear you would use to go up the hill.
use a lower gear than would be required to go up the hill.
shift into neutral and coast.
5. Which of these describes the proper braking technique when driving on a long and steep downgrade?
Apply the brakes. When your speed has been reduced to 5 mph below your safe speed, release the brakes. When your speed has increased to your safe speed, repeat the previous steps.
Apply the brakes until your speed has been reduced to 5 mph, then release the brakes. When your speed has increased to your safe speed, repeat the previous steps.
Release the brakes until your speed is 5 mph above your safe speed, then apply the brakes. When your speed has decreased to your safe speed, repeat the previous steps.
6. In vehicles with air brakes, the two markings on a front brake limiting valve are:
left and right.
normal and slippery.
high and low.
7. Which of the the following statements about fatigue is true?
Fatigued driving is one of the leading causes of accidents.
Fatigue impairs your vision and judgment.
All of the above.
8. Which of these is more likely to rollover due to the "crack-the-whip" effect?
The front trailer of 65 ft. conventional doubles
The last trailer of doubles
The last trailer of triples
9. When the temperature drops:
bridges will not freeze.
bridges will freeze before the road will.
bridges usually freeze after other parts of the roadway.
10. When driving in hot weather, drivers should inspect tires:
every 4 hours or every 200 miles.
every 2 hours or every 100 miles.
every 3 hours or every 75 miles.
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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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