Illinois CDL Practice Tests & Permit Guide
Everything Illinois drivers need to prepare for the CDL knowledge exam: state DMV details, fees, age requirements, and free practice questions for every endorsement.
| State | Illinois (IL) |
|---|---|
| State capital | Springfield |
| Licensing agency | Illinois Secretary of State Driver Services |
| Permit fee | $50 |
| License fee | $60 |
| Minimum age | 18 (intrastate) / 21 (interstate) |
About the Illinois CDL exam
Illinois operates dedicated commercial driver testing facilities including a major site at the Charles Chew Building in Springfield. The Illinois Secretary of State Driver Services administers the federal Commercial Driver License knowledge tests under 49 CFR Part 383, plus any state-specific addenda. Illinois CDL applicants must pass the federal General Knowledge exam plus knowledge tests for every endorsement they wish to add.
What to bring on test day
Bring your unexpired identity documents, proof of residency in Illinois, your current DOT medical examiner's certificate (or have it on file with the Illinois Secretary of State Driver Services), the $50 permit fee, and any required Entry-Level Driver Training (ELDT) certificate. Confirm the exact list with the Illinois Secretary of State Driver Services before your appointment because acceptable documents may change without notice.
Illinois practice tests by endorsement
General Knowledge
The General Knowledge exam is the foundation of every CDL.
Air Brakes
The Air Brakes test is required for any vehicle equipped with a full air brake system, an air-over-hydraulic brake system, or air-actuated parking brakes.
Combination Vehicles
The Combination Vehicles test covers driving tractor-trailers and other combinations with a Gross Vehicle Weight Rating over 26,001 pounds where the towed unit exceeds 10,000 pounds.
Hazardous Materials (Hazmat)
The Hazmat endorsement is required to transport materials in quantities requiring placards under 49 CFR 172.
Tanker
The Tanker endorsement is required to operate any commercial motor vehicle designed to transport liquid or gaseous materials in tanks of 1,000 gallons or more.
Doubles & Triples
The Doubles/Triples endorsement allows operation of vehicles pulling two or three trailers.
Passenger Transport
The Passenger endorsement is required to operate any commercial motor vehicle designed to transport 16 or more people including the driver.
School Bus
The School Bus endorsement allows operation of school buses transporting students.
Illinois CDL study plan
For most Illinois applicants, a five- to seven-day study plan works well. Start with the General Knowledge bank, then add Air Brakes if your vehicle has them, then layer endorsements (Combination, Hazmat, Tanker, etc.) one at a time. Use the practice questions to identify weak areas, re-read the relevant section of the Illinois CDL handbook, and re-test until you are scoring above 90%. The actual Illinois DMV exam typically requires 80% to pass.
Remember that the Illinois Secretary of State Driver Services skills test is administered separately from the knowledge test. After you pass the knowledge tests on this site's recommended schedule and complete any required ELDT, schedule your skills test through the Illinois Secretary of State Driver Services or an approved third-party testing facility.