CDL General Knowledge
CDL General Knowledge Practice Test (Free — 50 Questions) - 2026
The CDL General Knowledge test checks the safety topics every commercial driver needs before moving into class-specific or endorsement testing. This free practice test gives you 50 randomized questions from a 120-question bank covering safe driving, vehicle inspection, hazard awareness, space management, weather, emergencies, and cargo basics.
Quick answer
Practice 50 CDL General Knowledge questions at a time
Use this test when you want a full-length CDL General Knowledge practice session. A passing practice score is 80%, or at least 40 correct out of 50, but you should still verify final rules and test details with your state licensing agency.
CDL practice test
Build your CDL General Knowledge test
Answer 50 randomized questions from a larger CDL General Knowledge bank. You will see feedback and an explanation after every answer.
What it covers
CDL General Knowledge topics in this test
The question bank is built around common CDL General Knowledge study areas. It is not a replacement for your official state CDL manual, but it helps you check whether you can apply the rules in realistic driving situations.
- Driving safely, speed control, space management, and seeing hazards ahead.
- Vehicle inspection, basic vehicle control, backing, shifting, and communication.
- Distracted driving, fatigue, accident procedures, fires, and emergency response.
- Cargo securement basics, bad weather, mountain driving, curves, and skid recovery.
Sample questions
Static CDL sample questions for quick review
These examples are visible in the page HTML so learners and search crawlers can understand the question style even before the interactive test starts.
- When road conditions get worse, what should a CDL driver do first?Slow down early and increase following distance.
- Why is a pre-trip inspection important?It helps find unsafe tires, brakes, lights, leaks, steering issues, and required equipment before driving.
- What is the safer response when cargo may shift?Check securement and weight distribution before and during the trip.
- What should you do before a long downgrade?Select a proper low gear before descending and control speed early.
- What should a driver do after answering a question wrong?Read the explanation, identify the topic, then retest that weak area.
Focused test
Driving an air-brake vehicle?
General Knowledge is only the starting point. Review air-system components, pressure checks, spring brakes, leakage limits, ABS, and safe downgrade braking in a separate practice session.
Class A focused test
Preparing to drive tractor-trailer combinations?
General Knowledge is the foundation. Class A applicants should also understand coupling, fifth-wheel checks, trailer air systems, rollover prevention, off-tracking, backing, and combination brake checks.
After your score
Use your result to choose the next CDL step
If you miss several questions in the same topic, go back to your state CDL manual before trying another session. When your score is consistently above the passing line, check the state process, required class, and full CDL timeline.
FAQ
CDL General Knowledge practice questions
Is the CDL General Knowledge test required for every CDL class?
General Knowledge is the starting knowledge test for CDL applicants. Depending on your class and endorsements, your state may require additional written tests.
How many questions are in this practice test?
Each session gives you 50 randomized questions from a 120-question bank, so repeat sessions should feel different.
What score counts as passing?
This practice test uses an 80% passing score, which means 40 correct answers out of 50.
Should I still study my state CDL manual?
Yes. Use this practice test to check readiness, but use your official state CDL manual and DMV/licensing agency instructions for final rules, fees, and testing steps.
Official sources
CDL sources to verify before testing
US Permit Prep is independent and is not affiliated with FMCSA, any DMV, or any state licensing agency. CDL rules can change, so verify final requirements before scheduling.
CDL hub
Back to the full CDL study path
Use the CDL hub to compare CDL classes, review the full licensing process, and open state-specific CDL requirement pages.
Separate sign review
Review road signs separately
If signs are a weak area, take a focused Road Signs Test before your next CDL General Knowledge session.
Review Road Signs →