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Pass the CDL written test. Practice free.
General Knowledge, Air Brakes and Combination Vehicles. Each answer comes with a short explanation and the manual section behind it, so you learn the rule along with the letter.
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Question 1 Section 5.4
At 55 mph on dry pavement, about how much distance does air brake lag add?
Answer: D, About 32 feet
Air needs a moment to reach the brakes. At 55 mph on dry pavement this brake lag adds about 32 feet to your stopping distance.
Air Brakes Section 5.4.4 California CDL Handbook
Three tests. 598 checked questions.
General Knowledge
50 questions in most states80% to pass298 questions in the appTry 20 free questions: General Knowledge
Air Brakes
25 questions in most states80% to pass150 questions in the appTry 20 free questions: Air Brakes
Combination Vehicles
20 questions in most states80% to pass150 questions in the appTry 20 free questions: Combination Vehicles
How it works
Practice with answers
Sets of ten. After each answer you see a short explanation and the section of the manual it comes from.
Take the exam like the real one
The question count most states use and the 80% pass mark. You see the answers at the end, with the sections to review.
Clear your mistakes
A question you miss stays on your list until you answer it right twice. The readiness dial shows about what you would score today.
Written from the manuals
California, Texas and Florida build their handbooks on the same national model manual, with the same section numbers. We write every question in our own words and cite one section. Then we check the question against that section, and a script confirms that every number in it appears in all three handbooks.
- California Commercial Driver Handbook, DL 650, revised December 2019
- Texas Commercial Motor Vehicle Drivers Handbook, DL-7C, revised March 2026
- Florida Commercial Driver's License Manual, 2022 edition
- FMCSA, fmcsa.dot.gov, for federal rules
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