Illinois CDL Practice Test

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🚛 Illinois CDL Permit Practice Test Guide

Pass Your Illinois CDL Written Test the First Time

DMV-Written-Test helps aspiring commercial drivers in Illinois prepare with up-to-date practice exams based on the 2025 Illinois Commercial Driver License (CDL) Manual. These CDL practice tests simulate the real exam administered by the Illinois Secretary of State’s Office.

Whether you’re applying for a Class A, B, or C CDL, our practice tests cover essential areas like General Knowledge, Air Brakes, Combination Vehicles, and Illinois-specific laws.

For official CDL manuals, scheduling, and licensing information, visit the Illinois CDL page:
https://www.ilsos.gov/departments/drivers/CDL/home.html

Start preparing today to pass your CDL permit test with confidence in Illinois!

📘 What to Expect on the Illinois CDL Knowledge Test

Aspect Details
Number of Questions 50 (General Knowledge)
Passing Score 80% (40 correct answers required)
Test Format Multiple Choice
Time Limit Usually 60 minutes
Minimum Age 18 (intrastate); 21 for interstate and HazMat
Test Languages English, Spanish (others may be available)
Endorsement Areas Air Brakes, HazMat, Tankers, School Bus, Doubles/Triples
Retake Policy Next business day (fee may apply)

❓ Frequently Asked Questions

How do I qualify for a CDL permit in Illinois?
You must be at least 18 years old (21 for interstate driving), hold a valid Illinois Class D license, and pass the vision and written knowledge tests.
Is ELDT training required in Illinois?
Yes. Entry-Level Driver Training (ELDT) is federally required before taking the CDL skills test or certain endorsement exams.
How long is the Illinois CDL permit valid?
The Commercial Learner’s Permit (CLP) in Illinois is valid for 180 days and may be renewed once.
Can I take the CDL exam in Spanish?
Yes, the General Knowledge test is available in Spanish. However, the HazMat test is only offered in English.
What happens if I fail the CDL written test?
You must wait at least one business day to retake the test. A retesting fee may apply.
Do I need a regular license before applying?
Yes. You must already hold a valid Illinois driver’s license to apply for a CDL.
Do endorsements require separate tests?
Yes. Each CDL endorsement requires a separate written knowledge test and may require a skills test as well.
How do I transfer a CDL from another state to Illinois?
You must apply at a Driver Services facility within 30 days of becoming an Illinois resident.
What documents are required for a CDL in Illinois?
You must bring proof of legal name, date of birth, Social Security number, residency, and lawful presence.
Is HazMat training required separately?
Yes. In addition to ELDT, you must pass the TSA background check and HazMat knowledge test.