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CDL General Knowledge

Free CDL General Knowledge practice — the core written test every commercial driver must pass. Real test is in English; native-language explanations and English-term glossary help you learn. ~50 questions on the real test, 80% to pass.

🎯 주제별 연습

Pre-trip, en-route and post-trip inspections: tires, brakes, steering, suspension, the seven-step method, and what to check and why.

54 문제

Accelerating, steering, stopping, backing safely, and shifting gears: double-clutching, when to shift up/down, multi-speed axles, automatics, and retarders.

30 문제

Looking far enough ahead, using mirrors and blind spots, signaling your intentions, communicating your presence, and managing the space all around a large commercial vehicle (CDL General Knowledge §2.4, §2.5, §2.7).

42 문제

Adjusting speed to driving conditions: total stopping distance (perception + reaction + braking), how speed and weight affect stopping, traction and slippery surfaces, curves, visibility, traffic flow, downgrades and work zones.

30 문제

Spotting road and driver hazards early, reading clues to hidden hazards, always having a plan, distracted-driving dangers and the federal phone/texting bans for CMV drivers, and handling aggressive drivers and road rage.

30 문제

Night, fog, winter, very hot weather and mountain driving: headlights and glare, low beams and fog lights, slippery roads, wet brakes, brake fade, low gears and proper braking technique.

36 문제

Railroad-highway grade crossings: types of crossings, warning signs and devices, driving procedures, stopping safely, and crossing the tracks.

15 문제

Emergency steering and stopping, brake failure and escape ramps, tire blowouts, antilock braking systems (ABS), and recognizing and recovering from skids.

24 문제

Accident scene: protect the area, flashers, reflective triangles, notify authorities, care for the injured. Fires: causes, prevention, and using a fire extinguisher (classes, base of the fire, upwind, don't open a burning trailer).

18 문제

Cargo weight and balance: GVWR/GCWR/GAWR, legal weight limits, center of gravity and rollover, weight distribution over axles, blocking and bracing, tie-downs, header boards, covering loads, and cargo needing special attention.

21 문제

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