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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 Mississippi doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The MS CDL doubles triples test covers the following sections of the Mississippi CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this MS CDL practice test now to prepare for the actual test!
1. Texting while operating a commercial motor vehicle is:
acceptable if you are contacting your supervisor.
acceptable if you are contacting your dispacther.
only allowed at night.
2. When connecting to the rear trailer, the trailer height should be:
lower than the center of the fifth-wheel.
the same height as the fifth-wheel.
higher than the center of the fifth-wheel.
None of the above.
3. To prevent a rollover, the driver should:
drive slowly around corners, on ramps, and off ramps.
pay extra attention to the coolant level.
make quick lane changes if possible.
drive on the shoulder if possible.
4. Combination vehicles usually:
are easier to drive than single than single CMVs.
require more driving skill than single CMVs.
are shorter than single than single CMVs.
All of the above.
5. To prevent rollover, you should:
drive faster on ramps and off ramps.
drive slower around corners.
drive in the left lane whenever possible.
All of the above.
6. What is the minimum tread depth for tires other than front tires?
4/16 inch
8/32 inch
4/32 inch
2/32 inch
7. In your mirror, you see a car approaching from the rear. The next time you check your mirror, you don't see the car. If you wish to change lanes, you should:
assume the car left the roadway and change lanes as normal.
ease into the other lane slowly so the other car can get out of the way.
wait until you are sure the car isn't in your blind spot.
None of the above.
8. If you experience a loss of hydraulic pressure, you should do all of the following except:
Use the parking brake
Pump the brakes
Put the transmission in Neutral
9. If there is a cargo fire in a van or box trailer, you should:
keep the doors shut.
keep driving until you reach help.
enlist the help of bystanders.
open the doors, especially if your cargo contains hazardous materials.
10. When you double your speed, the braking distance is:
the same.
3 times longer.
4 times longer.
2 times longer.
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MS CDL Doubles 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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