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CDL Study Guide
The official CDL manual is the source of every knowledge test. This guide breaks it into the topics below. Written chapter guides are in production; each topic already links to live practice questions so you can study actively instead of just reading.
ABS & Anti-Skid
Written chapter guide in production. 20 practice questions are live now (from the Air Brakes bank):
Accident Procedures
Written chapter guide in production. 20 practice questions are live now (from the General Knowledge bank):
Air Compressor, Governor & Reservoirs
Written chapter guide in production. 20 practice questions are live now (from the Air Brakes bank):
Air Tank Draining, Alcohol Evaporators & Dryers
Written chapter guide in production. 15 practice questions are live now (from the Air Brakes bank):
Alcohol & Drug Rules
Written chapter guide in production. 25 practice questions are live now (from the General Knowledge bank):
Backing & Blind Spots
Written chapter guide in production. 20 practice questions are live now (from the General Knowledge bank):
Brake Fade, Heat & Downgrade Braking
Written chapter guide in production. 20 practice questions are live now (from the Air Brakes bank):
Brake Failure & Runaway Ramps
Written chapter guide in production. 15 practice questions are live now (from the General Knowledge bank):
Brake Inspection Steps & Defects
Written chapter guide in production. 30 practice questions are live now (from the Air Brakes bank):
Cargo Handling & Securement
Written chapter guide in production. 10 practice questions are live now (from the General Knowledge bank):
Cargo Securement Deep-Dive & Roadside Inspections
Written chapter guide in production. 20 practice questions are live now (from the General Knowledge bank):
Combination Braking, Skids & Jackknife Prevention
Written chapter guide in production. 30 practice questions are live now (from the Combination Vehicles bank):
Combination Vehicle Inspection
Written chapter guide in production. 25 practice questions are live now (from the Combination Vehicles bank):
Coupling Basics
Written chapter guide in production. 20 practice questions are live now (from the General Knowledge bank):
Coupling Equipment (Kingpin, Apron, Locking Jaws, Safety Latch)
Written chapter guide in production. 15 practice questions are live now (from the Combination Vehicles bank):
Dual Air Brake System & Components
Written chapter guide in production. 30 practice questions are live now (from the Air Brakes bank):
Emergencies & Skid Control
Written chapter guide in production. 10 practice questions are live now (from the General Knowledge bank):
Fatigue & Hours-of-Service Awareness
Written chapter guide in production. 25 practice questions are live now (from the General Knowledge bank):
Fifth Wheel & Coupling Steps
Written chapter guide in production. 35 practice questions are live now (from the Combination Vehicles bank):
Fire & Emergency Response
Written chapter guide in production. 20 practice questions are live now (from the General Knowledge bank):
Gladhands, Air Lines & Pintle Hook/Dolly
Written chapter guide in production. 15 practice questions are live now (from the Combination Vehicles bank):
Hazardous Materials Basics
Written chapter guide in production. 25 practice questions are live now (from the General Knowledge bank):
Hot Weather & Tire Heat
Written chapter guide in production. 15 practice questions are live now (from the General Knowledge bank):
Impairment, Fatigue & Distraction
Written chapter guide in production. 10 practice questions are live now (from the General Knowledge bank):
Leakage Rate Standards & Air Tests
Written chapter guide in production. 25 practice questions are live now (from the Air Brakes bank):
Off-Tracking & Turning Wide
Written chapter guide in production. 25 practice questions are live now (from the Combination Vehicles bank):
Powertrain & Brake System Basics
Written chapter guide in production. 30 practice questions are live now (from the General Knowledge bank):
Railroad Crossings & Other
Written chapter guide in production. 5 practice questions are live now (from the General Knowledge bank):
Railroad Crossings with Long Vehicles
Written chapter guide in production. 15 practice questions are live now (from the Combination Vehicles bank):
Safe Driving & Hazard Perception
Written chapter guide in production. 20 practice questions are live now (from the General Knowledge bank):
Safety Valve & Low-Pressure Warning
Written chapter guide in production. 20 practice questions are live now (from the Air Brakes bank):
Shifting, Gauges & Engine Controls
Written chapter guide in production. 25 practice questions are live now (from the General Knowledge bank):
Slack Adjusters & Pushrod Stroke
Written chapter guide in production. 20 practice questions are live now (from the Air Brakes bank):
Space & Speed Management
Written chapter guide in production. 15 practice questions are live now (from the General Knowledge bank):
Special Driving Conditions
Written chapter guide in production. 10 practice questions are live now (from the General Knowledge bank):
Spring Brakes, Parking & Emergency Brakes
Written chapter guide in production. 30 practice questions are live now (from the Air Brakes bank):
Tire & Suspension Faults
Written chapter guide in production. 20 practice questions are live now (from the General Knowledge bank):
Tractor Protection Valve, Trailer Brakes & Stab Braking
Written chapter guide in production. 20 practice questions are live now (from the Air Brakes bank):
Trailer ABS & Brake Checks
Written chapter guide in production. 15 practice questions are live now (from the Combination Vehicles bank):
Trailer Sway, Rollover & Rearward Amplification
Written chapter guide in production. 25 practice questions are live now (from the Combination Vehicles bank):
Uncoupling Steps & Safety
Written chapter guide in production. 25 practice questions are live now (from the Combination Vehicles bank):
Vehicle Inspection
Written chapter guide in production. 20 practice questions are live now (from the General Knowledge bank):
Weight, Space & Doubles/Triples Handling
Written chapter guide in production. 25 practice questions are live now (from the Combination Vehicles bank):
Winter & Cold-Weather Driving
Written chapter guide in production. 20 practice questions are live now (from the General Knowledge bank):
How to use this guide
- Pick the topic you are weakest on.
- Drill its questions in the practice tests and read every explanation — even for questions you got right.
- Re-check the same topic in the official manual for anything the explanations flag.
- Finish with a timed run in the Exam Simulator.