Kentucky CDL General Knowledge study guide
Kentucky CDL General Knowledge · Work through your exam, one topic at a time.
The Kentucky CDL General Knowledge test is the core written knowledge exam that Class A and Class B commercial driver license applicants must pass at a Kentucky Transportation Cabinet Division of Driver Licensing regional office. It checks whether you understand the safety rules, vehicle systems, and cargo and driving concepts that apply to any commercial motor vehicle, before you add endorsements such as air brakes, tank vehicles, hazardous materials, or school bus. The Kentucky CDL General Knowledge study guide has 12 sections and about 3,186 words.
01Driving Safely
Driving Safely is the broadest domain on the Kentucky CDL General Knowledge exam. It tests whether you can control a commercial vehicle defensively, scan for risk, manage speed and space, and respond to emergencies without losing control.
321 words, about 2 min02Transporting Cargo Safely
Transporting Cargo Safely tests load limits, weight distribution, securement, and inspection. A legal gross weight does not prove the axles or the load are safe.
290 words, about 1 min03Transporting Passengers
Transporting Passengers tests safe loading, standee rules, baggage control, emergency exits, and railroad-crossing procedure. The driver is responsible for passenger safety before the bus moves.
287 words, about 1 min04Air Brakes
Air Brakes tests the components and failure behavior of air-brake systems. You must know what warning signs mean and how to test the system before a trip.
268 words, about 1 min05Combination Vehicles
Combination Vehicles tests coupling, uncoupling, inspection, and control of a tractor-trailer. The exam focuses on the fifth wheel, air lines, landing gear, trailer brakes, and off-tracking.
294 words, about 1 min06Doubles and Triples
Doubles and Triples tests coupling and controlling multiple trailers. The extra articulation points increase off-tracking, rearward amplification, and the chance of a rollover or jackknife.
249 words, about 1 min07Tank Vehicles
Tank Vehicles tests liquid-load behavior, outage, baffles, and rollover prevention. Liquid movement changes braking and steering, especially in partly filled tanks.
232 words, about 1 min08Hazardous Materials
Hazardous Materials tests shipping papers, placards, labels, loading, parking, and emergency response. The goal is to keep incompatible materials apart and ensure responders can identify the hazard.
248 words, about 1 min09School Buses
School Buses tests loading and unloading, the danger zone, mirror use, stop arms, and student control. The driver must account for students before, during, and after every stop.
267 words, about 1 min10Vehicle Inspection
Vehicle Inspection tests the pre-trip and basic brake checks that must be done before driving. The exam expects a systematic walk-around, not a quick glance.
247 words, about 1 min11Basic Control of Your Vehicle
Basic Control of Your Vehicle tests starting, stopping, steering, backing, lane position, and emergency control. Smooth inputs matter more in a heavy vehicle because weight transfer is large.
244 words, about 1 min12Shifting Gears and Seeing Hazards
Shifting Gears and Seeing Hazards tests manual transmission control and hazard perception. The exam expects progressive shifting, correct gear selection, and early recognition of risk.
239 words, about 1 min