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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. Glad hands are:
securement devices.
coupling devices.
warning devices.
electronic devices.
2. When you turn suddenly, which trailer is most likely to turn over?
The last trailer of triples
The rear trailer of doubles
The front trailer
None of the above.
3. Hanging meat in a refrigerated truck can be:
a very stable load with a low center of gravity.
a very stable load if properly distributed.
a very unstable load with a low center of gravity.
a very unstable load with a high center of gravity.
4. Which of the following is not a type of retarder?
5. What happens when the center of gravity of a truck moves higher up from the road?
The vehicle is more stable while turning.
It becomes much easier to downshift at the right rpm.
The truck becomes easier to turn over.
It is easier it is to turn around corners.
6. 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.
downshift after your speed has already built up.
use a lower gear than would be required to go up the hill.
shift into neutral and coast.
7. The posted speed limit for a curve:
may be too fast for many trucks or buses.
is safe for trucks or buses, but it may be too fast for cars.
is safe for all vehicles.
is optional and may be exceeded.
8. When you see you will need to slow down, you can warn drivers behind you by:
making gestures.
turning on the right turn signal.
tapping the brakes a few times.
slamming on the brakes.
9. Who is responsible for inspecting the cargo?
The driver
The person who loaded and secured the cargo
The shipper
The motor carrier
10. When driving a 60-foot truck at 50 mph, your minimum following distance should be:
3 seconds
6 seconds
7 seconds
5 seconds
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AL CDL Doubles Triples Test

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