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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 Montana doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The MT CDL doubles triples test covers the following sections of the Montana CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this MT CDL practice test now to prepare for the actual test! Important: Triple trailers are not legal in Montana.
1. Retarders:
reduce the danger of slipping.
reduce braking distance.
improve gas mileage.
help slow a vehicle, reducing the need for using brakes.
2. Too little weight on the driving axles can cause:
poor visibility.
mechanical damage.
longer stopping distances.
poor traction.
3. You should be especially alert for drunk drivers:
in the early evening.
around shopping areas.
late at night.
in the morning.
4. When you turn suddenly, which trailer is most likely to turn over?
The front trailer
The rear trailer of doubles
The last trailer of triples
None of the above.
5. Why should you back toward the driver's side?
You can more easily correct any steering errors.
You can see better and watch the rear of your vehicle by looking out the side window.
Using double clutching requires practice.
All of the above.
6. Which of the following statements about backing heavy vehicles is true?
You should avoid backing whenever you can.
The helper should stand where you cannot see the helper.
Always back as quickly as possible.
Back to the right side so that you can see better.
7. If your trailer starts to skid, you should:
steer in the opposite direction.
release the brakes.
pump the brakes.
lock the brakes.
8. You should always try to back toward the driver's side because:
you can watch the rear of your vehicle out the side window.
you can more easily correct any steering errors.
backing toward the left side is more dangerous.
None of the above.
9. If you have to drive off the road, you should:
fully apply the brakes until your speed has dropped to about 20 mph.
leave the road completely.
keep one set of wheels on the pavement, if possible.
brake as hard as you can to maintain control.
10. Watch out for black ice:
when the temperature is above freezing and the road is dry.
any time the temperature is below freezing and the road looks wet.
right after it starts to rain.
when it is snowing.
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MT Doubles Triples Test

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