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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. Which of the following road surfaces freezes first?
Open roads
2. What should you do if you doubt you have safe space to pass under a low bridge?
Increase the weight of your vehicle to clearing under the bridge.
Assume that the height posted at the bridges is correct.
Go slowly, and take another route if you are not sure you can make it.
If no warnings are posted, assume there is enough clearance under the bridge and proceed slowly.
3. Empty trucks:
may have poor traction.
have better traction than fully-loaded trucks.
require shorter stopping distances than fully-loaded trucks.
None of the above.
4. When coupling a double or triple, ________ should be attached last.
the middle trailer.
the more heavily loaded trailer.
the trailer right behind the cab.
None of the above.
5. Air tank drains:
protect the tanks and the rest of the system from too much pressure.
are used to move air to the brakes.
should not be used in wet weather.
are used to remove water and oil from the air tanks.
6. If your brakes fail on a steep mountain downgrade, you should:
leave the road immediately.
change lanes after making sure there is enough room.
go right if the shoulder is clear.
use an escape ramp if it is available.
7. What can cause poor traction?
Too much weight on the steering axle.
Overloading the truck.
Too little weight on the driving axles.
All of the above.
8. You have two tie-downs on a 15 foot load. How many more tie-downs do you need to secure cargo and keep it from shifting or falling?
9. Your vehicle should be equipped with all of the following except:
Warning devices for parked vehicles
Spare electrical fuses
Fire extinguisher
Instructions on how to perform a vehicle inspection test
10. In a dual air brake system, if one air system is very low on pressure:
you should pump the brakes to restore pressure.
either the front or rear brakes will not be operating fully.
you should drive and brake as you always have.
the effect won't be noticeable for the first 50 miles.
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MT CDL Doubles Triples Test

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