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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 Louisiana doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The LA CDL doubles triples test covers the following sections of the Louisiana CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this LA CDL practice test now to prepare for the actual test!
1. You are driving a heavy vehicle with a manual transmission, and you have to stop on the shoulder while driving on an uphill grade. When putting your vehicle back in motion up the grade, you should:
shift down to a speed that you can control without using the brakes.
use the parking brake to hold the vehicle until the clutch engages.
keep the clutch slipping while slowly accelerating.
partly engage the clutch before you take your right foot off the brake.
2. The application pressure gauge:
shows how much air pressure is being applied to the brakes.
stops the compressor from pumping air.
protects the tank and the rest of the system from too much pressure.
tells you how much pressure is in the air tanks.
3. When approaching a double railroad track, you should:
remember that a train on one track may hide a train on the other track.
expect to hear a train when it's approaching.
remember that trains may be more frequent.
rely upon the presence of warning signals.
4. If the low air pressure warning light comes on, you should:
continue to drive normally.
call for help.
stop immediately.
set the parking brake.
5. Which of these statements about brakes is true?
Brake fade does not result from excessive heat.
The lighter the vehicle, the more heat the brakes absorb to stop it.
To stop, the brake shoes and linings are pushed against the outside of the drum.
None of the above.
6. Overloading a vehicle with cargo can have negative effects on all of the following except:
Speed control
Weight limits
7. During freezing weather, which area is most likely to be slippery after it rains?
Roads that look wet.
Shaded areas.
All of the above.
8. To prevent rollover, you should:
drive in the left lane whenever possible.
drive slower around corners.
drive faster on ramps and off ramps.
All of the above.
9. A bridge formula permits:
less maximum axle weight for axles that are far apart.
more maximum axle weight for axles that are far apart.
more maximum axle weight for axles that are closer together.
less maximum axle weight for axles that are close together.
10. If your ABS fails:
the first step is to get the vehicle off the road and stop.
you will have no brake function, and could lose control.
your tires might grab unexpectedly and you could lose control.
you will still have normal brake functions.
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LA 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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