CDL (Commercial Driver)
CDL General Knowledge Practice Test 40
Free — no payment neededLevel: Mixed
20 original CDL General Knowledge questions based on the federal motor carrier safety rules (49 CFR). Practice test, not affiliated with any government agency.
Created by AI
Practice test, not affiliated with any government agency. Original questions written from public sources, checked by a second AI reviewer and automated checks. Rules change; confirm with the official handbook. Available in 2 languages (translations are machine-made and checked automatically).
Before you start
- Questions
- 20 multiple-choice questions, one at a time
- Time
- About 12 minutes. Untimed — take as long as you need.
- Pass mark
- 16 out of 20 correct (80%)
- Feedback
- Your score, the correct answers and short explanations when you finish
- Account
- Not needed. Your answers stay in this browser.
What this test covers
Seeing and communicatingVehicle inspectionHours of serviceAlcohol drugs and fitnessRailroad crossingsDriver qualification and disqualification
Preview the first question
Which rule applies to a motor carrier about driver texting?
- The carrier may require it during emergencies or schedule changes only
- The carrier may not allow or require drivers to text while driving
- The carrier may allow it if drivers use one hand and keep their eyes up
- The carrier may allow it at stop lights
Answers are revealed on the results page after you finish.