Texas DMV CDL General Knowledge Quick Practice Test 4 For 2026

CDL Class A, B or C. Complete CDL driver training course. All the questions in this test are from the official DMV written exam. You can use our free online tests to evaluate how likely you are to pass the official DMV test. Or you can just cut to the chase and increase your chances of passing by upgrading to Premium Membership and unlock official DMV tests. In addition, you will also receive a master cheat sheet which contains all your state’s DMV questions and answers. Premium membership also unlocks a smart tracker which keeps an inventory of all incorrectly answered questions for easy, fast and effective revision. Practice with our free tests or hit Upgrade button below for premium access and increase your chances of passing your DMV written exam.

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Quick Facts:

Number of Questions – 20

Passing Percentage – 80%

Test Type – Free Test

1. If there is a cargo fire in a box trailer:

2. Header boards:

3. What should happen before the air pressure in an air brake system tank falls below 55 psi?

4. What can happen if your vehicle has a high center of gravity?

5. If transporting logs, a ____ light needs to be placed on the most extended point of the load.

6. When parked on the side of the road, you should:

7. ____ are the most likely to be affected by strong winds.

8. An item that is 40 feet long placed on a flatbed trailer should be secured by at least ____ tie-down(s).