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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 Maine doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The ME CDL doubles triples test covers the following sections of the Maine CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this ME CDL practice test now to prepare for the actual test!
1. In a dual air brake system, if one air system is very low on pressure:
either the front or rear brakes will not be operating fully.
you should pump the brakes to restore pressure.
you should drive and brake as you always have.
2. The tractor protection valve:
supplies air to the trailer air tanks.
keeps air in the tractor brake system should the trailer break away or develop a bad leak.
controls the emergency brakes on combination vehicles.
3. If you're feeling tired while driving you should:
drink coffee.
stop driving and get some rest.
eat something.
4. If an aggressive driver confronts you, you should NOT:
ignore gestures.
make eye contact.
try to let them pass.
5. You are driving a vehicle with air brakes when the low air pressure warning light and buzzer come on. You should:
pull off the road and stop immediately.
slow down and test your brakes.
activate your hazard lights and drive to the nearest place where you can stop.
6. Which of the following is most likely to roll over?
The front trailer of a double
The rear trailer of a double
The rear trailer of a triple
7. It is safer to drive over (rather than to avoid) which of the following?
Cardboard boxes
Paper and cloth sacks
None of the above.
8. When you double your speed, the braking distance is:
3 times longer.
the same.
4 times longer.
9. Which of the following is NOT correct? Anti-lock brakes:
require drivers to apply the brakes as hard as they can without locking the wheels.
give drivers more control over the vehicle during braking.
help drivers avoid skids caused by over braking.
10. The trailer hand valve should be used:
to check that the trailer emergency brakes are on.
to check that the trailer is locked onto the tractor.
to test the trailer brakes.
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ME CDL Doubles Triples Test

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