Free practice for the commercial driver’s license general knowledge test, with every answer explained.
Based on the CDL manual. Requirements can change, so confirm with your state’s licensing agency before your test.
Five steps from first try to test day. Your progress is saved on this device.
Each test has 20 questions. Get 16 or more right to match the 80% passing score.
The app has the rest of the CDL question bank, more tests and a timed exam simulator.
Sample questions
Think of your answer first, then open the explanation.
C. So you can slow down or change lanes gradually
Doubles and triples must be driven very smoothly to avoid rollover or jackknife, so look far ahead to slow or change lanes gradually.
C. Fresh leaks underneath and any leaning
Notice the general condition, look for damage or leaning, and look under the vehicle for fresh oil, coolant, grease, or fuel leaks.
C. Never
Never drive with an open emergency exit door or window.
What’s covered
Counts are from the full CDL question bank in the app.
More CDL tests, a timed exam simulator and a review of every question you miss.
Questions
The general knowledge test has 50 questions and you need 40 correct (80%) to pass. Endorsement tests such as air brakes, hazmat and combination vehicles are separate tests.
No. They are practice questions written from the CDL manual and cover the same topics. Your state’s licensing agency writes and gives the real test.
The USA DMV Test Prep app covers air brakes, combination vehicles, hazmat, tank vehicles, doubles and triples, passenger, school bus and pre-trip inspection.
Not a government website. USA DMV (usadmv.app) is an independent study resource. It is not affiliated with, endorsed by or operated by any state DMV, the Texas Department of Public Safety or any other government agency. Practice questions are written to reflect official driver handbooks but are not the official test questions. Always confirm current requirements with your state’s licensing agency.
