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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 Alabama doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The AL CDL doubles triples test covers the following sections of the Alabama CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this AL CDL practice test now to prepare for the actual test!
1. Emergency equipment is:
only required when transporting hazardous materials.
2. The best advice for driving in fog is:
don't drive.
drive slowly in the left lane of traffic.
use low beams.
use high beams.
3. No matter how small the cargo is, it should have at least:
6 tie-downs.
4 tie-downs.
2 tie-downs.
1 tie-down.
4. For safe handling, the heaviest trailer should be:
the second trailer in a triple.
the last trailer.
behind the tractor.
None of the above.
5. Large vehicles take longer to stop when they are:
heavily loaded but not fully loaded.
fully loaded.
carrying hazardous materials.
6. Emergency brakes are:
not required on commercial vehicles with air brakes.
required on all vehicles.
not required on buses.
not required on doubles.
7. When the temperature drops:
bridges will freeze before the road will.
bridges will not freeze.
bridges usually freeze after other parts of the roadway.
None of the above.
8. When going down a steep downgrade, you should primarily brake using:
the braking effect of the engine.
the parking brake.
the service brakes.
the emergency brake.
9. Which of the following is most likely to roll over?
The middle trailer of a triple
The rear trailer of a double
The front trailer of a double
The rear trailer of a triple
10. Which of the following statements about backing heavy vehicles is true?
The helper should stand where you cannot see the helper.
Back to the right side so that you can see better.
Always back as quickly as possible.
You should avoid backing whenever you can.
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AL 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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