Maryland CDL General Knowledge study guide
Maryland CDL General Knowledge · Work through your exam, one topic at a time.
The Maryland Commercial Driver's License (CDL) is the credential the MDOT Motor Vehicle Administration issues to drivers who operate commercial motor vehicles on Maryland roads. The MVA lists Commercial Driver's License (CDL) under its Licenses & IDs services, and it points commercial drivers to a dedicated business section of the site. The Maryland CDL General Knowledge study guide has 9 sections and about 2,982 words.
01General Knowledge: Inspection, Control, and Safety
Maryland's CDL General Knowledge domain tests the core skills that apply to every commercial vehicle: pre-trip inspection, basic control, shifting, backing, speed and space management, hazard perception, emergency procedures, railroad crossings, night and mountain driving, fatigue, and alcohol and drugs. The questions reward procedures you can explain step by step, not just definitions.
386 words, about 2 min02Air Brakes: Components, Tests, and Failure Modes
Maryland's Air Brakes domain tests the components, tests, and failure modes of a vehicle air brake system. You must know what the gauges tell you and the order in which to perform the CDL air brake checks.
352 words, about 2 min03Combination Vehicles: Coupling and Handling
Maryland's Combination Vehicles domain tests coupling, uncoupling, inspection, and the handling differences of tractor-trailers. A combination vehicle has more pivot points, more air lines, and more weight-transfer effects than a single unit.
336 words, about 2 min04Hazardous Materials: Paperwork, Placards, and Loading
Maryland's Hazardous Materials domain tests shipping papers, placarding, loading, and emergency response. A hazmat endorsement is required to drive a CMV carrying placarded amounts, and the questions often turn on thresholds and paperwork.
330 words, about 2 min05Cargo Securement: Working Load Limit and Tiedowns
Maryland's Cargo Securement domain tests whether a load stays on the vehicle in normal driving and emergency maneuvers. The exam focuses on working load limit, number of tiedowns, and protection of vehicle lights and occupants.
324 words, about 2 min06Passenger Transport: Loading, Exits, and Crossings
Maryland's Passenger Transport domain tests safe operation of buses and other CMVs carrying passengers. The examiner looks for pre-trip checks, passenger management, emergency exits, and railroad-crossing discipline.
310 words, about 2 min07School Bus: Danger Zone and Student Loading
Maryland's School Bus domain tests the highest-risk part of the job: loading and unloading children. The exam expects precise use of lights, mirrors, the stop arm, and the danger zone.
345 words, about 2 min08Tanker Vehicles: Surge, Outage, and Stability
Maryland's Tanker Vehicles domain tests the physics of liquid loads: surge, high center of gravity, and stopping distance. Tanker questions often ask why a smooth-bore tank behaves differently from a baffled tank.
292 words, about 1 min09Doubles and Triples: Dollies and Rearward Amplification
Maryland's Doubles and Triples domain tests coupling, air-line routing, and the handling of multiple trailers. More trailers mean more pivot points, more clearance problems, and stronger rearward amplification.
307 words, about 2 min