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Drivers who want to drive combination vehicles must pass the combination vehicles test. The Texas CDL combination test consists of 20 questions, and you'll need at least 16 correct answers to pass (80%). The test covers the combination vehicles section of the Texas CDL Manual. Take this practice test now to prepare for the actual TX CDL combination test!
1. If your vehicle is equipped with air brakes, loss of air pressure in the emergency line will cause:
the springs to put on the brakes.
the trailer supply valve to open.
the vehicle to slide back and forth.
the trailer emergency brakes to come on.
2. When approaching a vehicle with a distracted driver, you should:
sound your horn.
quickly pass the vehicle.
change lanes quickly.
maintain your safe following distance.
3. Never drive with landing gear only part way up. Why?
It may catch on railroad tracks.
It makes it harder to brake.
It may be harder to use.
It must be exactly 5 feet off the ground.
4. Livestock:
can move around in a trailer and cause unsafe handling.
should never be carried on a trailer.
should never be kept bunched together.
should always be placed in the rear of the trailer.
5. To prevent a rollover, you should keep the cargo as close to the ground as possible and:
keep the vents clear so they work correctly.
keep an eye on your tires.
go slowly around turns.
make sure that the release arm is in the engaged position.
6. 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:
ease into the other lane slowly so the other car can get out of the way.
assume the car left the roadway and change lanes as normal.
wait until you are sure the car isn't in your blind spot.
None of the above.
7. Most truck driver deaths in crashes result from:
truck rollovers.
following too closely.
driving side-by-side with another truck.
8. To prevent rollover, you should:
drive on the shoulder of the road when possible.
drive in the left lane.
turn the engine off while turning.
drive slowly around corners.
9. It's very important to distribute the cargo so it is:
as low as possible.
in the centre of the load.
piled up.
as high up as possible.
10. When you back under a trailer:
back the tractor slowly.
make sure the trailer brakes are locked.
use lowest reverse gear.
All of the above.
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TX Combination Test

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