CDL Written Knowledge Test

CDL Manual

All questions are based on information in the CDL Manual.

Closed-Book

All commercial driver license tests are closed-book multiple choice questions and require 80% to pass.

English Only

All CDL tests are administered in English only, and the use of translation materials is prohibited.

There are different written knowledge tests depending on the class of CDL you are applying for and the endorsements needed. Three tests make up the core testing for a CDL. These tests are included in the $52.00 license application fee. Each test may be taken up to two times before a second test fee of $26.00 will be required. Taking endorsement tests is optional. Endorsement fees are $9.00 for two attempts on written knowledge tests. An additional two test attempts are $9.00.

If you are ready to fill out the driver license application and schedule an appointment to obtain your CDL, click here.

This test is optional and can be taken by applicants for a Class A, B, or C CDL. This test is required if planning on driving a vehicle equipped with air brakes. If the written knowledge test is not taken and the driving skills test is not complete in an air brake-equipped vehicle, an "L" restriction will be placed on the license, restricting the applicant from driving a CMV not equipped with air brakes.

The air brake written knowledge test is 25 questions.

On September 29, 2025, the Federal Motor Carrier Safety Administration (FMCSA) published an interim final rule requiring states to pause the issuance of limited-term Commercial Driver's Licenses (CDLs) until they comply with the new rules and regulations. The State of Utah is currently working to meet these requirements and will update this page when it is able to resume issuing non-domiciled CDLs.