Missouri CDL Practice Test

Everyone takes General Knowledge. Add Air Brake to drive a vehicle with air brakes, Combination Vehicle for Class A combinations, Passenger for a bus, School Bus for a school bus, Tank for liquids or gases in tanks, Double/Triple to pull two or more trailers, and Hazardous Materials to haul placarded loads. Missouri Commercial Driver License Manual p. 14-2

The Missouri Commercial Driver License Manual (Revised August 2025): General Knowledge (Sections 1, 2 and 3 plus Missouri's own Section 14 on eligibility, permits, penalties, size and weight), Passenger, Air Brakes, Combination Vehicles, Doubles and Triples, Tank Vehicles, Hazardous Materials and School Bus. The manual says knowing its material is necessary to pass the written examination. Missouri Commercial Driver License Manual p. 14-1

General Knowledge has 50 questions, Air Brake 25, Hazardous Materials 30, and Combination, Double/Triple, Passenger, Tank and School Bus 20 each. You need 80% on every exam, and all of them are multiple choice. Missouri Commercial Driver License Manual p. 14-2 Why 80% in every state →

At any Missouri State Highway Patrol driver examination station. By state law the written tests are given only in English, with no translators. The manual is available online, at Highway Patrol exam offices and at Missouri license offices.

At least 18 for a CDL limited to driving within Missouri. Interstate driving, the hazardous materials endorsement and the school bus endorsement all need you to be at least 21. Missouri Commercial Driver License Manual p. 14-1

Be at least 18 with a valid Missouri driver license, pass the written tests for your class and endorsements at a Highway Patrol exam station, then take the completed test form and your documents (identity, lawful status, Social Security number and two proofs of Missouri residence) to a license office. Drivers in a non-excepted category also need a valid medical examiner's certificate.

It's issued for 360 days and can't be renewed. If it runs out, you retake the required knowledge tests for a new CLP, and any skills test parts you passed on the old one no longer count.

After holding your CLP for at least 14 days: a permit issued July 1 makes you eligible on July 15. Skills tests are by appointment only, with the Missouri State Highway Patrol or a certified third-party tester, and the pre-trip inspection, basic control and road test are taken in that order.

Yes, for a first Class A or B CDL, a first Class C with a passenger, school bus or hazmat endorsement, a class upgrade, or a first H, P or S endorsement, from a provider on FMCSA's Training Provider Registry. It isn't needed to add a tank or double/triple endorsement. Examiners must confirm it electronically before the skills test or the hazmat knowledge test.

No. New Missouri residents get a Missouri driver license, retake the commercial knowledge tests and get a Missouri CLP, which can all happen on the same day. Students who keep their home state may take the skills test in Missouri and have the results sent home.

Not at the moment. Since September 29, 2025, the Department of Revenue has suspended all new, renewal and duplicate non-domiciled CDL and CLP issuance, and the related knowledge and skills testing, until further notice, following a federal rule change.

Missouri Department of Revenue lists the current fees for the commercial learner permit, the CDL tests and the license on its official fee page.

Missouri's own standard is at least 20/40 in either eye or both eyes together, with or without glasses. Any extra restriction your DOT medical examiner sets also applies in a commercial vehicle, even if it isn't printed on the card: it is posted to your commercial driver record.

Yes. Active-duty or retired service members can apply for a skills test waiver if, in the 90 days before applying, they held a job driving a commercial vehicle and drove one for the military at least 60 days in the past two years. The knowledge tests are still required, and their results must be under 180 days old.

Yes, through the even exchange, which waives both the knowledge and skills tests for current or former members in some military driving jobs. You need a commercial driving job within the past year and two years of military truck driving before separation. Waiver applicants don't need entry-level training.

No. The form from the Highway Patrol examiner isn't a permit and doesn't start the 14-day clock: take it to a license office to get the CLP, then carry the CLP whenever you practice. A Missouri CLP is only valid together with a valid Missouri driver license.

Usually yes: every new or renewal CDL or CLP needs proof of citizenship, permanent residency or eligible immigration status. U.S. citizens whose documents were verified in an earlier commercial transaction, with the date posted to their record, may skip it later, unless they're getting their first REAL ID-compliant card.

Be at least 21 and a U.S. citizen or permanent resident, pass the hazmat written test at a Highway Patrol exam station, and get an approved TSA security threat assessment with fingerprints. It can't go on a CLP, you pass the written test again at every renewal, and the license expires no more than five years after the assessment.

The S endorsement needs you to be at least 21 and pass extra driving history checks; it may be added to a CLP after the School Bus written test. Drivers 75 and older retake the basic control and road skills tests at least every two years and get a license term of two years at most. Missouri Commercial Driver License Manual p. 14-3

Each disqualification is served in full before the next one begins. A disqualification removes only commercial privileges, so you may still drive your own car if your base license isn't suspended. Courts can't hide CDL holders' traffic violations through diversion, and driver improvement programs aren't allowed for them.

Electronically. Since June 23, 2025, Missouri no longer takes paper certificates: your examiner's results go to the driver record from FMCSA's National Registry. If your certificate lapses or can't be verified, your commercial status is downgraded. Missouri Commercial Driver License Manual p. 14-5

The Department of Revenue tells you that you're no longer medically certified. If a new certificate (and any variance) isn't on file within 60 days of the old one expiring, all CDL privileges are removed. You can usually get them back without retesting, unless you chose a non-commercial license or let the CDL stay expired over six months.

No. Missouri never issues limited driving privileges for commercial vehicles during a suspension, revocation or disqualification. If your base license is suspended, for example for points, a limited privilege can cover only non-commercial vehicles, and you don't have to downgrade the CDL to get one.

Yes. Your earlier record moves with you and appears on your Missouri record as informational driving history. If it holds serious or disqualifying offenses and you commit more while licensed in Missouri, the old and new offenses are added together to decide whether your commercial privileges are disqualified.

Missouri mails one renewal letter 90 days before your CDL expires; it's the only notice. Send TSA your application and fingerprints at least 30 days before expiry. While the check is pending you can get a 90-day CDL that keeps the hazmat endorsement. If TSA revokes it, you surrender the card and get one without hazmat.

State law requires at least 8 hours of special school bus training every year, and a medical examiner's statement every two years kept by the district or contractor, separate from your CDL medical certification. Fingerprint background checks go through your school district to the Department of Elementary and Secondary Education.

Your employer must report it to the Department of Revenue, which then suspends the school bus endorsement for one year. You can appeal in the circuit court where you live. This is in addition to any Clearinghouse downgrade or return-to-duty steps, and the endorsement can be reinstated after the year.