Missouri CDL General Knowledge study guide
Missouri CDL General Knowledge · Work through your exam, one topic at a time.
The Missouri CDL General Knowledge test is the written knowledge exam that anyone applying for a Commercial Driver License in Missouri must pass before taking the CDL skills (road) test. It is required for drivers of tractor-trailers, straight trucks, tank vehicles, buses, and other commercial motor vehicles, whether you are entering the industry or adding a class or endorsement. The Missouri CDL General Knowledge study guide has 11 sections and about 3,013 words.
01Vehicle Inspection and Basic Control
Vehicle Inspection and Basic Control tests whether you can identify unsafe equipment before moving and demonstrate a safe, deliberate start. The pre-trip is not a memorized chant; you must explain what you check, why it matters, and what defect would place the vehicle out of service.
307 words, about 2 min02Shifting, Backing, and Turning
Shifting, Backing, and Turning tests smooth gear use, controlled low-speed maneuvering, and turns that account for off-tracking. The examiner looks for deliberate control, not speed.
303 words, about 2 min03Space Management and Speed Control
Space Management and Speed Control tests following distance, speed selection, and cushion around the whole vehicle. The exam expects you to adjust space and speed before a problem develops.
305 words, about 2 min04Seeing Hazards and Hazard Perception
Seeing Hazards and Hazard Perception tests scanning, recognizing clues, and planning escape routes. The exam wants evidence that you see a hazard early enough to act smoothly.
265 words, about 1 min05Skid Control, Emergencies, and Crash Procedures
Skid Control, Emergencies, and Crash Procedures tests recovery from loss of traction and correct action after a failure or crash. The focus is on controlled, deliberate responses.
275 words, about 1 min06Railroad-Highway Crossings
Railroad-Highway Crossings tests approach speed, clearance judgment, and action if a vehicle stalls on the tracks. The exam emphasizes that trains cannot stop quickly.
266 words, about 1 min07Cargo Securement and Vehicle Loading
Cargo Securement and Vehicle Loading tests load placement, weight limits, and tiedown strength. The exam expects you to know that securement is a system, not a single strap.
262 words, about 1 min08Vehicle Systems, Inspection, and Maintenance
Vehicle Systems, Inspection, and Maintenance tests your ability to recognize defects in brakes, tires, lights, steering, suspension, and electrical systems before they become roadside failures. Build air pressure to governor cut-out, then check for excessive leakage with the engine off and brakes released.
276 words, about 1 min09Alcohol, Drugs, and Driver Fitness
Alcohol, Drugs, and Driver Fitness tests the CDL alcohol limit, drug prohibitions, and the driver's duty to avoid impairment from any source. A CDL driver may not operate a commercial motor vehicle with an alcohol concentration of 0.04 or greater.
241 words, about 1 min10Hours of Service and Fatigue
Hours of Service and Fatigue tests the driving limits, on-duty window, break requirement, and the effect of fatigue on CMV operation. Property-carrying drivers generally have an 11-hour driving limit and a 14-hour on-duty window.
243 words, about 1 min11Missouri and Federal Motor Carrier Safety Rules
Missouri and Federal Motor Carrier Safety Rules tests the framework that applies to CMV operation: CDL classes, driver qualification, inspections, weight and safety rules, and state traffic law. A CDL is required for a CMV with a gross vehicle weight rating of 26,001 pounds or more, or for certain passenger, tank, or hazardous-materials operations.
270 words, about 1 min