Missouri CDL Class B Practice Test (MO) 3

4.8 out of 5 (80 votes)
80% Passing score
20 Questions
4 Mistakes allowed
Get ready to take your skills to the next level with our Missouri CDL Class B Practice Test, the third in our comprehensive series of CDL practice tests. Designed to give you a realistic taste of what the actual CDL test entails in 2026, this permit practice test is a crucial tool in your preparation journey! Our Missouri CDL class B practice test consists of 20 carefully selected questions, reflecting a wide range of topics crucial for any Class B CDL applicant. To pass, you'll need to correctly answer at least 16 questions, a challenge that will test your knowledge and understanding of important driving concepts. The CDL practice test covers essential areas such as pre-trip vehicle inspection, basic vehicle control, gear shifting, handling hills and steep downgrades, communication with other drivers, speed control, and drug and alcohol awareness. What sets our Missouri CDL class B practice test apart is its basis in the real-world experiences and expertise of professional driving instructors. These experts, with decades of teaching experience and thousands of successful students, have crafted and reviewed each question. Their insights ensure that our CDL practice test not only challenges you but also provides a learning experience that is second to none. The DMV questions in this general knowledge test mirror the style and content of those in the official CDL driver's manual. This approach guarantees that our practice test is aligned with the actual Missouri CDL general knowledge test in 2026, as the real CDL test questions are also based on this manual. Furthermore, some questions involve scenarios drawn from real-life situations, offering you the opportunity to apply your theoretical knowledge to practical, on-the-road challenges. With each attempt of this Missouri CDL practice test, you will face the same set of questions, allowing you to gauge your progress and focus on areas that need improvement. This consistent approach helps reinforce learning and builds confidence as you prepare for the actual CDL written permit test in 2026!
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Sample Missouri CDL Test Questions - General Knowledge

Question 1

After selecting the proper low gear, how should you use the brakes on a long, steep downgrade?

  1. A Apply continuous light pressure for the entire downgrade
  2. B Use engine braking without ever applying the service brakes
  3. C Brake to about 5 mph below the safe speed, release, and repeat as speed returns
  4. D Use the parking brake together with engine braking

Correct answer: C – Brake to about 5 mph below the safe speed, release, and repeat as speed returns

Apply the brakes firmly enough to produce a definite slowdown. When the vehicle reaches approximately 5 mph below the selected safe speed, release the brakes; the application should last about three seconds. Allow the speed to return to the safe speed and repeat the process as needed.

Source: Missouri Commercial Driver License Manual — § 2.16.4, “Proper Braking Technique”

Question 2

A commercial vehicle is stopped on the shoulder of a divided highway in Missouri. Where should its three warning devices be placed?

  1. A 50 feet, 100 feet, and 150 feet in both directions
  2. B 10 feet ahead, 50 feet ahead, and 100 feet behind
  3. C Within 10 feet of the rear, then 100 feet and 200 feet toward approaching traffic
  4. D 100 feet ahead, 100 feet behind, and beside the cab

Correct answer: C – Within 10 feet of the rear, then 100 feet and 200 feet toward approaching traffic

Federal rules require one warning device at the traffic side within 10 feet of the vehicle's rear. The other devices are placed 100 feet and 200 feet toward approaching traffic in the lane or shoulder occupied by the vehicle. The CDL manual teaches the same 10-, 100-, and 200-foot pattern for divided and one-way highways.

Source: Missouri Commercial Driver License Manual — § 2.5.2, “Communicating Your Presence”, 49 CFR § 392.22(b)(2)(v) – Emergency signals; stopped commercial motor vehicles

Question 3

Beginning a right turn by swinging left may cause a following driver to attempt to pass on the right. True or false?

  1. A True
  2. B False

Correct answer: A – True

A following driver may interpret an initial swing to the left as the beginning of a left turn and try to pass on the right. The commercial vehicle can then strike that vehicle while completing the right turn. If additional room is needed, turn wide while completing the turn rather than swinging left before starting it.

Source: Missouri Commercial Driver License Manual — § 2.7.6, “Space for Turns”

Question 4

If hazardous material is spilling from your vehicle, which actions should you take?

  1. A Park and avoid moving the vehicle more than safety requires
  2. B Secure the area and keep others away
  3. C Remain at the scene and send someone else for help
  4. D All of the above

Correct answer: D – All of the above

Do not continue driving merely to find assistance when hazardous material is leaking. Park the vehicle, secure the area, remain at the scene, and send someone else for help. Move the vehicle only when safety requires it and the movement can be made without endangering people or spreading contamination.

Source: Missouri Commercial Driver License Manual — § 9.7.3, “Fires”

Question 5

Which steps are part of stab braking?

  1. A Apply the brakes fully
  2. B Release the brakes when the wheels lock
  3. C Reapply the brakes fully once the wheels begin rolling
  4. D All of the above

Correct answer: D – All of the above

Stab braking begins by applying the brakes fully. If the wheels lock, release the brakes and wait until the wheels begin rolling again before making another full application. Reapplying too soon keeps the wheels locked and prevents the vehicle from straightening out.

Source: Missouri Commercial Driver License Manual — § 2.17.2, “How to Stop Quickly and Safely”

Question 6

About how far ahead do properly operating high-beam headlights allow you to see?

  1. A 350 to 500 feet
  2. B 100 to 200 feet
  3. C 200 to 300 feet
  4. D 500 to 700 feet

Correct answer: A – 350 to 500 feet

High beams normally illuminate the roadway about 350 to 500 feet ahead. A driver must keep the vehicle's stopping distance within the visible area. Dirty or improperly adjusted headlights may substantially reduce the usable sight distance.

Source: Missouri Commercial Driver License Manual — § 2.11.4, “Vehicle Factors”

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