Missouri CDL General Knowledge

Anyone applying for a Missouri CDL in Class A, B, or C must pass the General Knowledge test before the skills test. It is also required when you add certain endorsements. If you already hold a CDL and are upgrading or adding a class, expect to test again on the general material.

It is a multiple-choice knowledge test taken on a computer at a Missouri State Highway Patrol driver examination station. You answer by selecting from the choices shown on screen. Confirm current station procedures, identification requirements, and scheduling through the Highway Patrol before your visit.

The official body publishes the current question count and passing score, and those figures can change, so this page does not state them. Check the Missouri State Highway Patrol and the current Missouri Commercial Driver License Manual for the numbers that apply on your test date.

Time limits and appointment length are set by the testing agency and are not fixed here. Plan for the knowledge test plus any other tests or endorsements you are taking the same day, and confirm expected duration and any time limit when you schedule at a Highway Patrol examination station.

Retake rules, waiting periods, and any additional fees are set by the Missouri State Highway Patrol and are not stated here. Ask at the examination station or check its site before you retest, and use the waiting time to review the chapters covering the questions you missed.

It is broad rather than tricky. Questions span inspection, control, space management, hazards, emergencies, crossings, cargo, vehicle systems, fitness, hours of service, and regulations. Candidates who read the manual cover to cover and practice scenario questions generally find it manageable; those who cram only the inspection chapter often struggle.

Start with vehicle inspection and basic control, then shifting, backing, and turning, because these underpin later chapters. Move to space management, hazard perception, and emergencies, then railroad crossings and cargo securement. Finish with vehicle systems, driver fitness, hours of service, and the safety rules, and review weak areas last.

Common causes are skimming the manual instead of reading it, ignoring cargo securement and hours-of-service rules, and guessing on scenario questions about following distance, skids, or railroad crossings. Another frequent mistake is assuming the test matches a free practice app rather than the current Missouri manual.

Yes. Expect questions drawn from Missouri and federal motor carrier safety rules alongside general driving material. Read the Missouri-specific sections of the manual carefully, since state rules on inspections, load limits, and crossings can differ from what generic study guides teach.

Bring the identification the Highway Patrol requires and arrive early. Read each question fully, watch for words like not and except, and answer scenario questions by asking what a safe professional driver would do. Verify current identification and document requirements on the Highway Patrol site beforehand.