Pennsylvania CDL General Knowledge study guide
Pennsylvania CDL General Knowledge · Work through your exam, one topic at a time.
The Pennsylvania CDL General Knowledge test is the written knowledge exam that PennDOT Driver and Vehicle Services requires before a candidate can move forward toward a Commercial Driver's License. It is aimed at drivers who intend to operate commercial motor vehicles - tractor-trailers, straight trucks, tank vehicles, buses, and combinations - and who need to demonstrate a working command of safe vehicle operation before skills testing. The Pennsylvania CDL General Knowledge study guide has 16 sections and about 4,038 words.
01Vehicle Inspection
Vehicle inspection questions ask you to find defects before a trip and to know which defects make a vehicle unsafe. The Pennsylvania CDL General Knowledge test draws on the pre-trip inspection you must perform and the conditions that put a vehicle out of service.
321 words, about 2 min02Basic Control
Basic control covers starting, moving, steering, and stopping a heavy vehicle smoothly. Questions test your understanding of clutch and throttle coordination, idle creep, and control at low speed.
268 words, about 1 min03Shifting
Shifting questions test progressive shifting, clutch use, and matching engine speed to road speed. The exam expects you to know how to shift without lugging, over-revving, or coasting.
275 words, about 1 min04Backing
Backing questions test the four basic rules: start from a good position, back slowly, use mirrors, and get out and look. The exam also tests helper use and blind-side backing.
256 words, about 1 min05Seeing
Seeing covers visual search, following distance, mirror use, and blind spots. Questions ask how far ahead to look and how much space to keep.
264 words, about 1 min06Communication
Communication covers turn signals, four-way flashers, horn use, brake lights, and headlights. Questions test how you tell other drivers what you intend to do.
242 words, about 1 min07Speed Management
Speed management covers posted limits, curves, downgrades, work zones, and stopping distance. Questions test whether you can choose a safe speed for the road and load.
240 words, about 1 min08Space Management
Space management covers following distance, lane position, overhead clearance, and side clearance. Questions test whether you keep room to stop and room to maneuver.
230 words, about 1 min09Hazard Perception
Hazard perception tests your ability to scan, identify, predict, decide, and execute. Questions describe a developing situation and ask what you should do first.
219 words, about 1 min10Emergency Maneuvers
Emergency maneuvers cover brake failure, tire blowout, skids, and off-road recovery. Questions test whether you can respond without making the situation worse.
247 words, about 1 min11Railroad Crossings
Railroad crossing questions test stopping, looking, listening, and clearance. The exam emphasizes that a train cannot stop quickly and always has the right of way.
258 words, about 1 min12Night Driving
Night driving covers headlights, speed, glare, and fatigue. Questions test whether you can see and be seen after dark.
252 words, about 1 min13Extreme Driving Conditions
Extreme conditions cover winter, rain, fog, hot weather, and mountains. Questions test how weather changes traction, visibility, and vehicle behavior.
231 words, about 1 min14Vehicle Systems
Vehicle systems covers air brakes, tires, lights, engine, suspension, and warning devices. Questions test whether you understand what a warning means and what to check.
239 words, about 1 min15Cargo
Cargo questions cover securement, weight limits, and dimensions. The exam tests whether you can load and secure a vehicle legally and safely.
262 words, about 1 min16Crash Procedures
Crash procedures cover stopping, protecting the scene, aiding the injured, and reporting. Questions test the legal and safety steps after a collision.
234 words, about 1 min