Free Missouri CDL Practice Tests 2026

• Test Administrator: Missouri State Highway Patrol
• Test Locations: All Highway Patrol testing offices
• Required Passing Score: 80% on each exam
• General Knowledge Test: 50 questions
• Air Brake Test: 25 questions
• Combination Vehicle Test: 20 questions
• Special Endorsement Tests: 20-30 questions each
• CDL License Fee: $20.00 (3 years or less), $40.00 (3 years and 1 day to 6 years)
• Written Test Fee: $25.00
• Skills Test Fee: $25.00
• Processing Fee: $6.00 (document issued for 3 years or less), $12.00 (document issued for 3+ years)

The Missouri CDL knowledge test evaluates your knowledge of commercial driving regulations and safe driving practices. You must pass this test to get a Commercial Learner's Permit (CLP) before you can take the skills test for a full Commercial Driver License (CDL). The test covers federal and Missouri-specific requirements including vehicle operation, safety regulations, traffic laws, and safe operating procedures. It's administered electronically at Missouri State Highway Patrol testing offices throughout the state.

You need to take the CDL knowledge test in Missouri if you're:

• Getting your first Commercial Learner's Permit
• Adding a new endorsement to your existing CDL
• Upgrading your CDL class (from Class B to Class A for example)
• Reinstating a CDL that has been expired for over one year
• Transferring a CDL from another state with new endorsements

All applicants must take the general knowledge test plus additional tests for specific endorsements like Passenger (P), School Bus (S), Tank Vehicles (N), Hazardous Materials (H), or Double/Triple trailers (T).

The CDL knowledge test ensures commercial drivers have the necessary knowledge to operate commercial vehicles safely. The test verifies your understanding of regulations, safety practices, technical knowledge, and emergency procedures. Commercial vehicles can cause significant damage in accidents due to their size and weight, so proper knowledge and training are essential before operating these vehicles. The knowledge test is the first step in making sure you're prepared for the responsibility of commercial driving.

Missouri's CDL testing program follows Federal Motor Carrier Safety Administration (FMCSA) standards while also addressing state-specific regulations. This ensures consistency in commercial driver qualifications across the nation while meeting Missouri's particular requirements. This means your Missouri CDL will be recognized throughout the United States, allowing you to operate commercial vehicles across state lines (as long as you meet age and other requirements for interstate commerce).

Different CDL tests have varying numbers of questions:

• General Knowledge: 50 questions
• Air Brakes: 25 questions
• Combination Vehicles: 20 questions
• Passenger Endorsement: 20 questions
• School Bus Endorsement: 20 questions
• Hazardous Materials Endorsement: 30 questions
• Tank Vehicles Endorsement: 20 questions
• Double/Triple Endorsement: 20 questions

All questions are multiple-choice with four possible answers for each question.

Sample question: When checking your trailer connection, you should make sure that:

A. The fifth wheel is tilted upward

B. There is no space between the upper and lower fifth wheel

C. The kingpin is bent

D. The apron is sitting on top of the fifth wheel

Answer: B. There is no space between the upper and lower fifth wheel

You must answer 80% of questions correctly on each test to pass:

• General Knowledge: 40/50 questions correct
• Air Brakes: 20/25 questions correct
• Combination Vehicles: 16/20 questions correct
• Passenger Endorsement: 16/20 questions correct
• School Bus Endorsement: 16/20 questions correct
• Hazardous Materials Endorsement: 24/30 questions correct
• Tank Vehicles Endorsement: 16/20 questions correct
• Double/Triple Endorsement: 16/20 questions correct

Each test is scored separately and you must pass each one individually. If you fail one test but pass others, you'll only need to retake the failed test.

The CDL knowledge test in Missouri is only available in English. Federal regulations require commercial drivers to read and speak English sufficiently to understand traffic signs, communicate with officials, complete records, and understand shipping documents. This ensures all commercial drivers can safely navigate roadways, communicate with law enforcement and emergency services, and properly handle documentation. There are no exceptions to this language requirement for CDL testing in Missouri.

No. You cannot use notes, electronic devices, reference materials, or calculators during the test. Testing areas are monitored, and using prohibited materials will result in test failure. All personal items must be stored in a designated area during testing.

Prohibited items include:

• Cell phones and electronic devices
• Notes or cheat sheets
• Commercial Driver License manuals
• Reference materials of any kind
• Calculators (unless specifically authorized for certain questions)

Using prohibited materials during testing could result in immediate disqualification and may affect your ability to test again in the future.

There is no time limit for the CDL knowledge tests in Missouri, but most applicants complete the general knowledge test in 60-90 minutes. Most endorsement tests take 30-45 minutes each. Plan accordingly if taking multiple tests in one visit. If you have documented learning disabilities or other special needs, accommodations may be available with proper documentation.

• General Knowledge – A must-pass for all CDL categories.
• Air Brakes – If your vehicle has air brakes, this test is required.
• Combination Vehicles – For Class A drivers operating large rigs.
• Passenger (P) Endorsement – Needed to drive buses or similar vehicles.
• School Bus (S) Endorsement – Required for all school bus drivers.
• Doubles/Triples (T) Endorsement – For hauling more than one trailer.
• Tank Vehicles (N) Endorsement – For moving liquid cargo.
• Hazardous Materials (H) Endorsement – For hazardous freight hauling.

Each test covers knowledge specific to a vehicle type or driving role. You only need to take the tests for the type of commercial driving you will be doing.

Sample question: When driving with air brakes, what is brake lag?

A. Time for brakes to wear out

B. Time for air to flow through lines when brake pedal is pressed

C. Time to move foot from accelerator to brake

D. Time to pull parking brake

Answer: B. Time for air to flow through lines when brake pedal is pressed

General Knowledge: Vehicle inspection, basic control, shifting gears, space management, night driving, adverse weather conditions, emergency procedures, cargo handling, accident procedures, fires, fatigue awareness, and basic hazmat regulations.

Air Brakes: System components and function, dual air brake systems, inspecting air brakes, proper use in various conditions, emergency stops, brake system failures, and brake lag/fade.

Combination Vehicles: Coupling and uncoupling procedures, inspection points, handling characteristics, rollover prevention, jackknife avoidance, turning techniques, and backing procedures for combination vehicles.

Passenger (P): Passenger loading and unloading procedures, proper use of emergency exits, passenger communication, accessibility requirements, dealing with disruptive passengers, and railroad crossing requirements for passenger vehicles.

School Bus (S): Student loading and unloading procedures, emergency evacuation protocols, operating around schools, railroad crossing procedures, student management, danger zones around the bus, and special equipment.

Double/Triples (T): Coupling and uncoupling multiple trailers, handling characteristics during various maneuvers, inspection procedures, identifying and correcting handling problems, and operating in adverse conditions.

Tank Vehicle (N): Liquid surge and weight distribution effects on handling, baffled versus non-baffled tanks, loading/unloading procedures, and special braking for partially full tanks.

Hazmat (H): Classification and identification of hazmat, proper documentation, loading/unloading procedures, driving rules, emergency response procedures, and security awareness.

To study for your Missouri CDL test:

• Study all relevant sections of the Missouri CDL Manual for your license class and endorsements
• Take practice tests to get used to the test format
• Study over several weeks rather than cramming
• Make flashcards for tough concepts and technical terms
• Spend more time on tricky topics (air brakes, hazmat)
• Review pre-trip inspection procedures thoroughly
• Pay attention to Missouri-specific regulations and requirements
• Study vehicle systems and components until you understand how they work

The key is to study consistently over time rather than last-minute cramming. Many applicants underestimate the technical knowledge required, especially for endorsements.

Yes! Practice tests are a great way to study for your Missouri CDL test. Free practice tests help you:

• Identify knowledge gaps in your understanding
• Build confidence through repetition
• Simulate the actual test environment and format
• Track your progress as you improve
• Understand explanations for correct and incorrect answers
• Get familiar with the types of questions on the actual test

Our free practice tests cover all CDL test categories and are updated regularly to match current testing standards. Using practice tests has been shown to increase first-time pass rates.

Follow these tips to increase your chances of passing the CDL test:

• Start studying 2-3 weeks before your test date
• Understand concepts rather than memorize answers
• Take practice tests to focus on weak areas
• Get plenty of rest the night before your test
• Eat a good meal before testing to stay focused
• Read questions completely before answering
• Look for keywords like "always," "never," or "except" that can change the question
• Choose safety-oriented answers when unsure
• Review all answers before submitting if the testing system allows
• Stay calm and focused during the test

Sample question: When do you use turn signals?

A. Only when other vehicles are present

B. At least 100 feet before turning

C. Just as you begin to turn

D. Only when changing lanes

Answer: B. At least 100 feet before turning

Our practice tests cover the same topics and format as the actual Missouri CDL knowledge test, but the specific questions are different. Our questions mimic the style, difficulty, and content of the actual Missouri CDL knowledge test. The practice tests help you get familiar with:

• Question formats and wording
• Content coverage and depth
• Time management during testing
• Critical thinking skills needed for test success

Focus on understanding concepts rather than memorizing specific answers as the actual test draws from a large question bank and each test is unique.

CDL knowledge tests are given at Missouri State Highway Patrol testing offices throughout the state. Not all Highway Patrol offices offer CDL testing, so check the MSHP website or call ahead to confirm.

Major testing locations are available in all Missouri State Highway Patrol Troop areas:

• Troop A: Lee's Summit (816) 622-0800
• Troop B: Macon (660) 385-2132
• Troop C: Weldon Spring (636) 300-2800
• Troop D: Springfield (417) 895-6868
• Troop E: Poplar Bluff (573) 840-9500
• Troop F: Jefferson City (573) 751-1000
• Troop G: Willow Springs (417) 469-3121
• Troop H: St. Joseph (816) 387-2345
• Troop I: Rolla (573) 368-2345

For written knowledge tests, appointments are not always required but are recommended to avoid long wait times. Check with your local Highway Patrol testing office for their appointment policy. To schedule an appointment for CDL knowledge testing, contact your local Missouri State Highway Patrol Troop Headquarters directly by phone.

No. All CDL knowledge tests must be taken in person at authorized Missouri State Highway Patrol testing offices to ensure security, identity verification, and test integrity. This is a federal requirement that applies to all states, not just Missouri. In-person testing prevents cheating and ensures the person receiving the CDL is the one who demonstrated the knowledge.

Required documents for CDL knowledge testing:

• Valid Missouri driver's license
• Social Security card/number
• Proof of citizenship/legal residency (birth certificate, passport, permanent resident card, etc.)
• Proof of Missouri residency (two documents showing your Missouri address)
• Current DOT Medical Certificate (Form MCSA-5876)
• Completed CDL application
• Payment for applicable fees (cash, check, or credit card)
• For Hazardous Materials: Additional identification documents for security threat assessment

Other items to bring:

• Reading glasses if needed
• Appointment confirmation (if applicable)

All documents must be original or certified copies. Photocopies are not accepted. If you're unsure about document requirements, contact the Missouri Department of Revenue before your appointment.

Arrive 15-20 minutes early to allow time for:

• Document verification
• Application processing
• Fee payment
• Getting settled before the test begins

If you arrive late, you may have to reschedule. First-time applicants should arrive 30 minutes early to allow time for additional paperwork processing. Traffic and parking at testing facilities can be unpredictable, so plan accordingly.

If you pass the required CDL knowledge tests, you'll get a Commercial Learner's Permit (CLP) valid for one year (360 days) with these conditions:

• Must wait at least 14 days before taking the skills test
• Can only drive with a qualified CDL holder in the passenger seat
• No passengers except supervisors, trainees, or examiners
• No hazardous materials transport
• Other restrictions based on vehicle type/endorsements

Specific endorsements you passed tests for will be included on your CLP.

With your CLP, you can practice driving commercial vehicles while supervised before taking your skills test. This practice time is crucial to develop the skills needed to pass the behind-the-wheel test. You must be accompanied by a CDL holder who has the proper class of license for the vehicle you're operating. The supervising driver must sit in the front passenger seat.

Your knowledge test scores are valid for one year (360 days), the same as your CLP. If your CLP expires before you complete the skills test, you'll need to retake all knowledge tests. There are no extensions on score validity, so plan to complete your skills test within the one-year window to avoid having to retest. This ensures your knowledge is current when you get your full CDL.

If you fail any CDL knowledge test:

• You must wait until the next business day to retest
• You only need to retake the sections you failed
• Use our practice tests to focus on weak areas
• Review incorrect answers to understand why they were wrong
• Consider studying with different methods if you're struggling with particular topics

There's no limit to how many times you can retest in Missouri, but repeated failures may indicate you need more preparation.

Sample question: What happens if you fail a section of the test?

A. Wait 30 days before retesting

B. Retest immediately at another location

C. Wait until the next business day to retest

D. Retest all sections, even those passed

Answer: C. Wait until the next business day to retest

After holding your CLP for at least 14 days:

• Call the Missouri State Highway Patrol to schedule your skills test
• Make sure your CLP is valid and medical certificate is current
• Arrange for a test vehicle that matches your CDL class
• Pay the skills test fee ($25)
• Choose a date and time from available slots

The skills test consists of a pre-trip inspection, basic vehicle control, and on-road driving demonstration. Make sure you're prepared for all three parts before scheduling.