illinois CDL Practice Test

Welcome to the Illinois CDL Practice Test site. This is a free site and you are able to take the tests as a study guide as you prepare for the Illinois CDL test. The topics covered in these practice tests are taken from the Illinois CDL book. You will be presented with 40 questions and you must answer 34 questions correctly to pass. There is a 50-minute time limit. You may not go back once you answer a question. Click the “Start Test” button below to begin. 

illinois Drivers Test

illinois Motorcycle Test

illinois CDL Test

CDL Category Practice Tests

CDL General Knowledge Test

Combination Vehicles Test

Passenger Vehicles Test

Pre-Trip Inspections Test

Double/Triple Trailers Test

CDL School Bus Test

CDL Air Brakes Test

Hazardous Materials Test

CDL Tanker Vehicles Test

CDL Practice Test

How To Get An illinois Commercial Drivers License

Applicants can apply for their CDL and any endorsements they wish at the age of 21 years old. Those under the age of 21, but over the age of 18 are eligible to receive an in-state only CDL. Those under 21 are not eligible for driving hazmat vehicles or transporting passengers. All applicants must supply a Department of Transportation (DOT) medical certificate and pass the CDL vision test in order to be qualified to receive their CDL. All applicants are required to pass a vision test, knowledge test(s), and a practical skills assessment in order to be considered for a CDL license.

Any applicant that is described by any of the sentences below is considered disqualified from getting their CDL.

  • A driver that has their commercial driving privileges revoked in another state.
  • Any driver convicted of driving impaired in a commercial vehicle in the past 24 months.
  • A driver that possess more than one driver’s license.
  • Any driver whose license is currently denied, canceled, suspended, or revoked.

L – Air Brake Restriction
X – Combination
P – Passenger
C – Charter Bus
T – Doubles/Triples
H – Hazardous Materials
S – School Bus
N – Tank

Hit the Open Road

illinois CDL License Test Tips

The written exam or knowledge test is required of all CDL applicants. This exam is comprised of 50 specific questions about commercial driving. Those applying for endorsements must complete an additional knowledge test for that endorsement. These tests are between 20 and 30 questions. Those who are applying for a Class A CDL must complete an additional 20 questions about combination vehicles. All knowledge tests must be passed with a grade of 80 percent or more for an applicant to receive their CDL permit.

The Illinois CDL skills assessment must be completed by an applicant. Each assessment includes a pre-trip inspection, basic control skills, and on-road driving test. The on-road driving test includes real-life driving instances, such as low clearance bridges, downgrading for a stop, increasing gears, curves, expressways, and other instances. These are mean to ensure the applicant is fully capable of driving a commercial vehicle safely.

Additional Information

Information on the Office of the Illinois Secretary of State

The Office of the Illinois Secretary of State is responsible for the administration of the CDL requirements and testing in Illinois. To get more information contact them via:


Phone:  800.252.8980


Additional Illinois CDL Helpful Links

Please use the links below to access more valuable Illinois CDL testing resources and to learn more about practice driving tests for the state of Illinois.