Free Practice Tests for the CDL

As with any license, obtaining a CDL can be a challenging endeavor, but we’re here to help! While the exact questions you will encounter on test day are not made public by the DMV, our free CDL practice test will give you a feel for the test material, level of difficulty, and types of questions you will encounter when you take the actual exam.





Air Brakes Test

You need to take the Air Brakes test if you plan on driving a truck or bus equipped with air brakes. The test covers parts of both dual and single air brake systems, including when they are used, normal and abnormal findings, and troubleshooting. The Air Brakes test is unique because, unlike the endorsement tests, passing does not earn you a positive mark on your license. Rather, if you fail the test or do not take the skills test in a vehicle that uses air brakes, your license will be marked with an air brakes restriction. This section has a road test component that must be passed in addition to the written portion.

While most regulations are similar, if not the same, please be sure to also check the manual for the state in which you take the CDL test. Those are the guidelines you should consider correct for you.

Combination Vehicles Test

If you want to drive combination or Class A vehicles―including straight trucks and trailers, doubles and triples, and tractor-trailers―then you have to take the Combination Vehicles test. The test covers the driving and inspection of different combinations, as well as coupling and uncoupling.

State regulations and guidelines may vary. Consider the ones for your state to be the final source of information.

Doubles/Triples Test

To drive a tractor with two or three trailers, you must pass the doubles/triples test and have a Class A license. This endorsement measures your knowledge of coupling and uncoupling, the inspection and pulling of double/triple trailers, as well as checking of air brakes.

Most of the regulations on national and state levels are similar or the same. If they differ, please assume that your state guidelines are the ones that apply to your situation.

General Knowledge Test

To attain a Commercial Driver’s License (CDL), you must take and pass the General Knowledge section of the CDL test. This section covers general safety and cargo transportation rules associated with driving a commercial motor vehicle.

On occasion, state regulations may differ. Please consider your state’s manual to be the final authority.

Hazardous Materials Test

If you aim to drive a vehicle that hauls hazardous wastes or substances, you must take and pass the Hazardous Materials test. Hazardous materials can include gases, solids, explosives, flammable and combustible liquids, and other materials. Because of the health and safety threat these items pose, their handling is heavily regulated by the government. As these rules and regulations are subject to change, you must be retrained and retested on the material every two years to keep this endorsement current. To help you prepare for this test, the Hazardous Materials practice test on this site covers items that measure your knowledge of proper communication, driver responsibilities, driving and parking rules, loading and unloading, regulations, and emergency situations.

Please note: Certain specific regulations, such as limits for transporting a particular substance, may vary between states. Please consult your state’s CDL manual as the final authority for the figures in these regulations.

Passenger Transport Test

If you wish to drive a vehicle that transports eight or more for hire (such as a bus or limo), you must take and pass the Passenger Transport test. To help you prepare for this test, the Passenger Transport section in this practice test covers bus safety and inspection rules. In addition to the written test, this endorsement also has a road test component you must pass.

Different states may have slightly different regulations in some instances. If so, your state manual is the one to follow when studying for this test.

Tanker Test

Take and pass the Tanker test if you will be driving a truck that carries liquids or liquid gas in excess of 1,000 gallons or more. The Tanker test covers topics such as tanker truck inspections and proper driving procedures.

Please consider your state CDL manual to be the final authority when regulations differ between it and national guidelines. National guidelines were used to develop our test practice.




We hope you find our practice tests useful as you study to obtain your CDL license! Used in combination with your state’s Commercial Driver’s License Manual, you should be able to pass the test the first time or greatly improve your test scores if you’re taking it again. If you ever have any questions, please feel free to reach out to us on social media via Facebook, Twitter, Google+, or Pinterest, or by email at info@uniontestprep.com. Happy studying and best of luck as you begin this exciting new chapter in your trucking career!