CDL (Commercial Driver)
CDL General Knowledge Practice Test 39
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.
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
Hours of serviceVehicle inspectionRailroad crossingsSeeing and communicatingAccident proceduresAlcohol drugs and fitness
Preview the first question
Which time is counted as on-duty time under the federal definition?
- Time resting in a parked vehicle
- Time resting in a sleeper berth
- Time inspecting or servicing the vehicle
- Time off duty at home
Answers are revealed on the results page after you finish.