CDL General Knowledge Practice Test 2026
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Source: CDL Manual — General KnowledgeLast verified: Unknown · Not yet verified
🎯 Practice by Topic
Vehicle Inspection
Pre-trip, en-route and post-trip inspections: tires, brakes, steering, suspension, the seven-step method, and what to check and why.
Basic Control of Your Vehicle
Accelerating, steering, stopping, backing safely, and shifting gears: double-clutching, when to shift up/down, multi-speed axles, automatics, and retarders.
Seeing, Communicating & Managing Space
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).
Controlling Speed
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.
Seeing Hazards & Distracted Driving
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.
Driving in Special Conditions
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.
Railroad-Highway Crossings
Railroad-highway grade crossings: types of crossings, warning signs and devices, driving procedures, stopping safely, and crossing the tracks.
Driving Emergencies, ABS & Skid Control
Emergency steering and stopping, brake failure and escape ramps, tire blowouts, antilock braking systems (ABS), and recognizing and recovering from skids.
Accident Procedures & Fires
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).
Transporting Cargo Safely
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.