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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. ABS:
helps you avoid skids caused by over braking.
may cause your wheels to lock when you break hard.
helps you stop faster.
improves your visibility at night.
2. Many large vehicles have convex (curved, "spot, "fisheye") mirrors. Convex mirrors:
make things look smaller and farther away than they really are.
are illegal in most states.
misrepresent reality by showing a larger area than flat mirrors.
None of the above.
3. If your brakes fail on a steep mountain downgrade, you should:
go right if the shoulder is clear.
leave the road immediately.
change lanes after making sure there is enough room.
use an escape ramp if it is available.
4. Watch out for black ice:
any time the temperature is below freezing and the road looks wet.
when it is snowing.
when the temperature is above freezing and the road is dry.
right after it starts to rain.
5. Foundation brakes are used:
at each wheel.
only with the front wheels.
only with the right wheels.
only with the rear wheels.
6. You should always adjust your speed to be able to stop within:
the distance you can see ahead.
50 feet.
30 feet.
the length of your vehicle.
7. You are driving a vehicle with air brakes when the low air pressure warning light and buzzer come on. You should:
apply the brakes as hard as you can.
activate your hazard lights and drive to the nearest place where you can stop.
slow down and test your brakes.
pull off the road and stop immediately.
8. Before operating the vehicle, the driver should:
rely on the last vehicle inspection and skip the pre-trip inspection.
review the last vehicle inspection report.
should not review the vehicle inspection report and immediately try to find any vehicle defects.
None of the above.
9. If the safety relief valve in the air brake system releases air:
the valve is fully operational.
this will supply more power to the brakes.
this will supply more power to the drive wheels.
something is wrong.
10. You should flash your brake lights to warn drivers behind you when:
you see a hazard that will require slowing down.
you see a bus stops in the roadway ahead to unload passengers.
you see you'll need to slow down.
All of the above.
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AL Doubles Triples Test

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