CDL (Commercial Driver)
CDL General Knowledge Practice Test 30
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
Vehicle inspectionHours of serviceDriver qualification and disqualificationSeeing and communicatingRailroad crossingsAccident procedures
Preview the first question
When checking steering wheel free play on a truck with power steering, what must be true?
- The engine must be off
- The tires must be turned fully left
- The parking brake must be off with wheels raised
- The engine must be running
Answers are revealed on the results page after you finish.