Every section.
Explained properly.
Concept-first study mapped to the thirteen sections of the standard CDL manual structure. Read the summary, practice the section, then verify the details in your state's official manual.
Pick a section. Master it.
Difficulty tags show where most drivers need extra time. Sections 2, 5 and 6 include free practice.
General Knowledge
What a CDL is, who needs one, and the rules that govern every commercial driver.
- CDL classes & endorsements
- Licensing rules & disqualifications
- Vehicle weight ratings (GVWR/GCWR)
- Basic rules for commercial vehicles
Driving Safely
The core section of the exam — vehicle control from inspection to emergencies.
- Vehicle inspection basics
- Shifting & speed management
- Space & following distance
- Night, weather & emergencies
Transporting Cargo
How to load, secure, and document cargo without losing points — or a load.
- Weight limits & axle loads
- Securing cargo & tie-downs
- Covering & sealed loads
- Balance & center of gravity
Transporting Passengers
Passenger endorsement rules for buses and passenger-carrying CMVs.
- Pre-trip with passengers aboard
- Loading & unloading rules
- Standee line & aisle rules
- Emergency procedures
Air Brakes
The section drivers fail most — air systems explained in plain language.
- System components & tanks
- Dual air systems & gauges
- Brake lag & stopping distance
- Low-pressure warnings & spring brakes
Combination Vehicles
Tractor-trailer essentials: coupling, control, and preventing rollovers.
- Coupling & uncoupling sequence
- Fifth wheel & kingpin checks
- Trailer skids & rollover prevention
- Air & electric lines
Doubles & Triples
Pulling more than one trailer — stability, coupling, and inspection.
- Converter dollies
- Coupling order & sequences
- Crack-the-whip effect
- Inspecting multiple trailers
Tank Vehicles
Liquid loads move — learn to manage surge before it manages you.
- Liquid surge & braking
- Baffled vs. unbaffled tanks
- Outage & loading rules
- Stopping on wet surfaces
Hazardous Materials
HazMat endorsement basics: placards, papers, and safe handling.
- Placarding basics
- Shipping papers & markings
- Loading & segregation rules
- Emergency response information
School Buses
School bus endorsement — the danger zone, students, and crossings.
- Danger zones & mirror setup
- Loading & unloading students
- Railroad crossing procedures
- Evacuation procedures
Pre-Trip Inspection
What to check, in what order, and how to explain it on test day.
- Engine compartment checks
- In-cab inspection & gauges
- Lights, reflectors & coupling
- Brake system checks
Basic Control Skills
The backing maneuvers every Class A driver is scored on.
- Straight-line backing
- Offset backing (left & right)
- Alley dock
- Pull-ups & boundaries
On-Road Driving
The road test itself — what examiners watch for at every turn.
- Intersections & turns
- Lane control & merges
- Expressway driving
- Railroad crossings & bridges
Three passes to mastery.
Read the concept summary
Plain-language explanations of what the section covers and why it matters on the road — not just on the test.
Practice the section
Original questions with instant feedback. Every answer explains itself and cites the manual section to re-read.
Verify in your state's manual
Direct links take you to the official source, so you study the exact wording your state uses.
Air brakes & pre-trip,
done properly.
Sections 5 and 11 sink more test days than any others. We cross-reference them so the inspection sequence and the air system finally make sense together.
Stop memorizing.
Start understanding.
Ten free questions with full explanations — see the difference for yourself.