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CDL permit practice test

Ten general knowledge questions, explained.

Free practice quiz

The general knowledge test is the first written test for every CDL. These questions are written in the style of the state CDL manuals. Your state's manual is the real source, so read it alongside this quiz.

In short

The CDL general knowledge test checks safe driving rules for large vehicles: inspections, stopping and following distances, space management, hazards, cargo, and basic air brake ideas. Many states give 50 questions and require 80 percent to pass, with separate tests for air brakes and combination vehicles. This 10-question practice quiz covers common topics and explains each answer, so you know what to review in your state's manual.

Sources checked October 9, 2026Pay, training and outlook come from the U.S. Bureau of Labor Statistics. Pay is the middle (median) figure nationally; your first paycheck in the trade will usually be lower.
1. Total stopping distance is made up of perception distance, reaction distance and
2. If your vehicle is 40 feet long and you are driving under 40 mph, how much following time should you leave?
3. The minimum tread depth for front (steering) tires is
4. Hydroplaning can happen at speeds as low as
5. When stopped on the road, you must put out warning devices within
6. Most serious skids result from
7. In an emergency, you can usually avoid a crash faster by
8. When should you choose a low gear for a long downhill grade?
9. Cargo should be tied down with at least one tiedown for every
10. Before going on duty, a driver must

What is on the real test

TestWho takes it
General knowledgeEveryone
Air brakesDrivers of vehicles with air brakes
Combination vehiclesClass A
Endorsements (hazmat, tanker, doubles and triples, passenger, school bus)Drivers who need them

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Straight answers

How many questions are on the CDL general knowledge test?

Many states use 50 questions with an 80 percent passing score. Check your state's driver licensing agency.

Is the CDL permit test hard?

It is very passable if you read your state's CDL manual and practice.

Can I take the CDL permit test online?

Most states require you to test in person at a licensing office.

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