What’s on the CDL General Knowledge Test?

The general knowledge test is the core written exam every CDL applicant must pass, regardless of license class or endorsements. It’s built directly from your state’s CDL manual.

The Topics You’ll Be Tested On

While questions vary by state, the general knowledge test consistently covers:

Vehicle inspection — walking around your vehicle and checking critical safety items.
Basic control — steering, stopping distance, and handling your vehicle.
Shifting and gears — when and how to change gears, including on hills.
Backing — safe backing procedures and knowing your blind spots.
On the road — speed limits, lane positioning, and sharing the road.
Air brakes — brake system operation and inspection (if the vehicle has air brakes).
Accidents and emergencies — what to do after a crash, fire, or breakdown.

How Many Questions?

Most states have 50 questions on the general knowledge test. You typically need around 80% to pass. State rules differ slightly, so confirm the exact count and passing score in your manual.

Test Format

Questions are multiple choice, often with scenario-style wording that tests understanding rather than memorization. Because the wording can vary, it’s important to understand the concepts, not just the answers.

How to Prepare

Read your state’s CDL manual — it’s the source of every question.
Study signs and signals — they appear throughout the test.
Take lots of practice tests to build confidence and timing.
Review every wrong answer to close knowledge gaps.

2026 Updates

Regulations are updated regularly, and manuals get revised each year. Always download the current version of your manual rather than relying on old study materials. Practice questions reflect the latest rules of the road and vehicle requirements.

Ready to see how you’d do right now? Start a free general knowledge practice test today.