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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 should test the coupling by:
disconnect the safety chains.
applying the parking brakes so the rig will not move.
locking the pintle hook.
pulling against the pin of the second semitrailer.
2. You are driving a double. Before entering traffic, you should:
always come to a complete stop.
turn on your headlights.
make sure you have a large enough gap before entering or crossing traffic.
assume there is enough room to merge into traffic.
3. Before driving a vehicle with a dual brake brake system, the driver should:
pump the brake pedal 10 times to build pressure.
allow time for the air compressor to build up a minimum of 100 psi pressure in both the primary and secondary systems.
wait at least 5 minutes before driving.
wait at least 10 minutes before driving.
4. If you must make an emergency stop, you should:
use the hand brake before the brake pedal.
brake in a way that will keep your vehicle in a straight line.
apply the brakes as hard as you can to lock them.
None of the above.
5. If your brakes fail on a steep mountain downgrade, you should:
decide what to do as soon as you know your brakes do not work.
set the parking brake and park in an open area.
stay on the road and keep looking for the next available escape ramp.
slow down until your vehicle comes to a complete stop.
6. When backing, you should:
use the mirrors on both sides.
back quickly.
back and turn toward the right side whenever possible.
only use mirror on the driver's side.
7. Why should you back toward the driver's side?
You can see better and watch the rear of your vehicle by looking out the side window.
You can more easily correct any steering errors.
Using double clutching requires practice.
All of the above.
8. If you hear a loud loud "bang" and the steering feels "heavy", you should:
check your rearview mirrors to see if you have a flat tire.
brake hard and pull off the road.
hold the steering wheel firmly and stay off the brake.
pump the brakes until the vehicle has slowed down.
9. If you must stop on a one-way or divided highway, you should place warning devices _______ toward the approaching traffic.
5, 50 and 500 feet
3, 15 and 45 feet
10, 100 and 200 feet
5, 25 and 50 feet
10. When you push in the red trailer air supply knob, this will:
disconnect the electrical connector.
disconnect the air lines from the trailer.
supply air to the emergency supply lines.
open the emergency line shut-off valve at the rear of the last trailer.
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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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