Illinois CDL Practice Test 2026 & Illinois SOS Rules
Prepare for your commercial driver's license with the official Illinois exam curriculum. TruckerPass combines the 985 federal FMCSA questions with Illinois-specific commercial vehicle limits, air brake testing, and the 2026 Modernized Pre-Trip inspection.
Illinois Chicago Low Overpasses & Tollway Rules
- Chicago city streets feature hundreds of historic railway viaducts under 12 feet clearance; commercial drivers must strictly follow Class I/II truck routes.
- Illinois Tollway system (I-90, I-88, I-294) uses I-PASS open road tolling; vehicles with wide loads must use designated manual lanes.
- Winter weather in central and northern Illinois brings severe ground blizzards and black ice across open prairie interstates.
- Illinois SOS requires 80% on the 50-question CDL General Knowledge exam.
Official Illinois Test Format
- Licensing Agency: Illinois Secretary of State (SOS)
- General Knowledge: 50 questions, 80% to pass (at least 40 correct).
- Air Brakes Endorsement: 25 questions, 80% to pass (required for air-equipped rigs).
- Combination Vehicles: 20 questions, 80% to pass (Class A tractor-trailers).
- Modernized Pre-Trip Inspection: 4-Zone component walkaround + 4-Step air brake test.
🎁
Download Free 2026 Illinois Pre-Trip Cheat Sheet PDF
Get our printable 4-Zone AAMVA Walkaround & Air Brake Recitation Guide used by top trucking schools, plus instant VIP notification when TruckerPass hits the App Store & Google Play.
Test your readiness in 60 seconds
Take our 5-question quick check to see your initial readiness score and discover how our offline-first engine helps you pass on the first attempt.
Try the Free Diagnostic Test →