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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. For safety during a trip, you should:
watch gauges for signs of trouble.
use your senses to check for problems.
check critical items when you stop.
All of the above.
2. Combination vehicles usually require _________ single commercial vehicles.
more driving skill than
the same level of skill as
less driving skill than
None of the above.
3. Which of the following may have reduced the clearances since the heights were posted at bridges and overpasses?
The weight of a cargo
Repaving of the road
4. Which of the following vehicles is most likely to turn over?
5 axle tractor semitrailer
3 axle tractor semitrailer
65 ft. conventional double
Triple trailer
5. Which of the the following statements about fatigue is true?
Fatigue may cause you to not see and react to hazards.
Fatigue impairs your vision and judgment.
Fatigued driving is one of the leading causes of accidents.
All of the above.
6. Blocking and bracing are:
driving techniques used to regain control when your drive wheels start to skid.
used to keep cargo from sliding and to prevent movement of cargo.
coupling devices used to connect the service air lines from the truck or tractor to the trailer.
None of the above.
7. 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.
8. Engine oil pressure should come up to normal within _________ after the engine is started.
five minutes
ten minutes
two minutes
9. Warnings on low bridges or underpasses:
are often posted, but sometimes they are not.
must be posted.
are always posted.
None of the above.
10. If the low air pressure warning light comes on, you should:
set the parking brake.
call for help.
stop immediately.
continue to drive normally.
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AL Doubles Triples CDL Test

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