Knowledge test: CDL
You must pass the knowledge test:
- Before you can take the skills test required to get your first Commercial Driver License (CDL).
- Each time you add a class of vehicle to your CDL.
- Each time you add special endorsements to your CDL.
- To remove the air brake restriction.
You may take the knowledge test at any driver licensing office that offers testing.
How to prepare
- Study the Commercial driver guide to prepare for the test. All the information you’ll need to pass the test is in this guide.
- You may also take the practice test for a sample of the types of questions that will be on the test.
Frequently asked questions
How long are test scores valid?
Test scores are valid for 1 year from the date of the test.
Can I get additional endorsements after I get my CDL?
After you’re issued a CDL, you may get additional endorsements or remove the air brake restrictions by taking additional knowledge and skills tests and paying all applicable fees.
Do I have to take the tests to reinstate a CDL or endorsement?
Drivers who surrender their CDL or any endorsement will be required to pay all applicable fees, and may be required to retake knowledge and driving tests depending on the circumstances surrounding the surrender of the CDL or endorsement.
Are there penalties for trying to get a CDL fraudulently?
If you try to get a CDL fraudulently, your driver license may be cancelled and you may be required to wait for up to 1 year before you can reapply for a CDL.
