Illinois CDL Manual and Test Resources

The Illinois Commercial Driver’s License Study Guide is the primary study source for Illinois CDL applicants. It covers commercial licensing, safe driving, cargo, air brakes, combination vehicles, endorsements, vehicle inspection, basic control skills, and road-test preparation.

CDL Mastery can help you organize the material and practice individual topics, but the current Illinois study guide and official Secretary of State instructions should remain your final authority.

Illinois age requirements You must be at least 18 to apply for an Illinois CDL or commercial learner’s permit for intrastate operation. You must generally be at least 21 to operate in interstate commerce or transport passengers.

Official Illinois CDL study guide

The Illinois Secretary of State publishes the Commercial Driver’s License Study Guide through its commercial-driver publications page. English and Spanish versions are available.

Open Illinois commercial-driver publications

Open Illinois CDL and CLP information

Major Illinois CDL study-guide topics

The sections you must study depend on your requested CDL class, vehicle equipment, endorsements, and intended commercial operation.

Introduction and licensing: CDL classes, endorsements, restrictions, disqualifications, and application requirements.
Driving Safely: vehicle inspections, speed, space management, hazards, emergencies, railroad crossings, and difficult conditions.
Transporting Cargo Safely: cargo weight, balance, securement, inspections, and cargo-related risks.
Passenger Vehicles: loading, unloading, prohibited practices, emergency equipment, and passenger safety.
Air Brakes: system components, warning devices, pressure, spring brakes, leakage tests, and safe braking.
Combination Vehicles: coupling, fifth wheels, trailer air lines, rollover prevention, off-tracking, and inspections.
Doubles and Triples: converter dollies, coupling order, handling, and inspection procedures.
Tank Vehicles: liquid surge, outage, vehicle stability, and safe operation.
Hazardous Materials: placards, shipping papers, loading, parking, security, and emergency procedures.
School Buses: student loading, warning systems, railroad crossings, inspections, and emergency procedures.
Skills testing: pre-trip inspection, basic control skills, and the driving and road test.

Illinois CDL and non-CDL classes

Illinois classifies licenses according to vehicle and combination weight ratings. Some Illinois vehicle classes differ from the way commercial classes are commonly summarized elsewhere, so applicants should review the official classifications carefully.

Class A: A combination with a gross combination weight rating of at least 26,001 pounds when the towed vehicle exceeds 10,000 pounds.
Class B: A single vehicle with a gross vehicle weight rating of at least 26,001 pounds, or such a vehicle towing no more than 10,000 pounds.
Class C: A single vehicle rated at least 16,001 pounds but less than 26,001 pounds, subject to Illinois licensing and commercial-use rules.
Class D: A single vehicle with a gross vehicle weight rating below 16,001 pounds.

Passenger capacity, hazardous-material transportation, school-bus operation, and other specialized uses may create additional CDL or endorsement requirements.

Illinois commercial learner’s permit

To obtain an original Illinois CLP, the applicant must hold a valid Illinois CDL or non-CDL license as the base license. The base license must remain valid during the CLP period.

An Illinois CLP is generally valid for one year from the date the temporary card is received. Illinois sends a secure permanent CLP card to the applicant’s address after issuance.

Verify your mailing address Illinois states that the permanent CLP may take up to 15 business days to arrive. An incorrect address can delay receipt and may interrupt additional CDL testing.

Every Illinois CLP holder must hold the permit for at least 14 calendar days before completing the applicable CDL skills and drive tests.

The application process generally includes:

Hold a valid Illinois base driver’s license.
Meet the applicable age requirement.
Provide required identity and residency documentation.
Complete the required commercial self-certification.
Meet applicable medical requirements.
Pass the vision examination.
Pass the required CDL knowledge examinations.
Pay the applicable permit and testing fees.

Review Illinois CLP requirements

Illinois CDL knowledge examinations

The exact examinations depend on the requested CDL class, endorsements, restrictions, and representative vehicle.

Possible examinations include:

General Knowledge.
Air Brakes.
Combination Vehicles.
Passenger Transport.
School Bus.
Tank Vehicles.
Doubles and Triples.
Hazardous Materials.

Illinois requires a minimum score of 80 percent on most applicable CDL knowledge tests. The Illinois School Bus knowledge test requires a minimum score of 90 percent.

Knowledge and written-test results may remain valid for up to one year, although the valid period can be shorter depending on the applicant’s circumstances.

Failure waiting periods Illinois applies escalating waiting periods after repeated failures of the same CDL examination. Three failures trigger a 30-day waiting period, six total failures can trigger 90 days, and nine total failures can trigger a one-year waiting period.

Entry-Level Driver Training

Federal Entry-Level Driver Training requirements apply to many first-time Class A and Class B applicants, Class B-to-Class A upgrades, and first-time passenger, school bus, or hazardous-material endorsement applicants.

When ELDT applies, the required training must be completed through a provider listed in the FMCSA Training Provider Registry before the applicable Illinois examination.

Passenger and school bus applicants must complete applicable ELDT before scheduling the pre-trip, basic skills, and road tests.

Search the FMCSA Training Provider Registry

Illinois CDL medical certification

Illinois CDL applicants and holders must identify the type of commercial operation they perform or expect to perform. The selected self-certification category determines whether a valid Medical Examiner’s Certificate is required.

Non-excepted interstate drivers generally must obtain an examination from a medical examiner listed in the National Registry of Certified Medical Examiners.

Drivers who are required to maintain medical certification should verify that their medical status remains current in the Illinois record. An expired or missing certification can affect commercial driving privileges.

Review Illinois CDL medical requirements

Illinois CDL skills and road tests

Illinois divides CDL skills and drive testing into three major parts.

Pre-trip inspection: identifying safety-critical components and explaining the condition being checked.
Basic control skills: demonstrating required low-speed control and backing maneuvers.
Driving and road test: demonstrating safe operation on an approved predetermined route.

The applicant must test in a properly classified representative vehicle that matches the desired CDL class, endorsements, and restrictions.

Proof of vehicle insurance, valid license plates, and required vehicle safety inspections must be presented before testing.

Illinois does not allow video or recording devices during the pre-trip, basic-skills, or driving test.

Open the Illinois CDL Skills and Drive Information Sheet

Scheduling an Illinois CDL test

CDL skills and drive testing requires an appointment. Illinois provides online appointment scheduling and telephone scheduling through the Secretary of State.

Applicants may schedule a future appointment before completing the full 14-day CLP waiting period, but the actual test date must fall after the required waiting period.

Schedule or review an Illinois CDL appointment

Illinois third-party CDL testing

Illinois licenses and regulates certain private companies, municipalities, fire departments, and governmental agencies that participate in the CDL Third-Party Certification Program.

Approved entities may conduct CDL skills and road examinations for qualifying employees who need commercial driving privileges for their daily work.

The program is not necessarily a general public testing option. Applicants should confirm eligibility directly with the participating employer or entity.

Review the Illinois Third-Party Certification Program

Illinois air-brake restrictions

The vehicle used for testing determines whether an air-brake restriction is placed on the CDL.

L restriction: Prohibits operation of a commercial motor vehicle equipped with air brakes.
Z restriction: Restricts the driver from operating a commercial vehicle equipped with a full air-brake system.

To remove an L restriction, the applicant must pass the applicable air brake knowledge examination and complete required testing in a vehicle with an appropriate air-brake system.

Illinois may require the applicant to hold the corrected CLP for 14 days before completing the restriction-removal skills and drive test.

Manual-transmission and tractor-trailer restrictions

Testing in a vehicle that does not represent the equipment the driver expects to operate can result in CDL restrictions.

E restriction: Prohibits operation of a manual-transmission commercial vehicle when the skills test was completed in an automatic vehicle.
O restriction: Restricts operation of a Class A tractor-trailer combination when testing was completed in a non-tractor-trailer Class A vehicle.

Illinois passenger endorsement

A passenger endorsement requires applicable knowledge testing and a skills and drive test in a representative passenger vehicle.

Applicants obtaining or adding a passenger endorsement must generally hold a CLP with the passenger endorsement for at least 14 days before completing skills and drive testing.

Passenger endorsement applicants subject to ELDT must complete the required training before scheduling the state skills test.

Illinois school bus requirements

Illinois has additional requirements for drivers transporting students. Depending on the operation, a driver may need a CDL, passenger endorsement, school bus endorsement, and an Illinois School Bus Permit.

School bus applicants should study both the Passenger Vehicles and School Buses sections of the Illinois CDL guide.

Skills testing for the school bus endorsement must be completed in a properly classified yellow school bus.

Illinois HazMat endorsement

A hazardous materials endorsement requires additional state and federal steps beyond the standard CDL application.

The process may include:

First-time HazMat Entry-Level Driver Training.
Passing the Illinois HazMat knowledge test.
Providing required identity and lawful-status documents.
Completing TSA fingerprinting and a security threat assessment.
Maintaining required CDL and medical qualifications.

Open Illinois HazMat and CDL facility information

Illinois Tank and Doubles/Triples endorsements

The Tank endorsement requires a knowledge examination covering liquid surge, outage, tank vehicle control, and inspection.

The Doubles and Triples endorsement requires a knowledge examination covering coupling order, converter dollies, stability, inspections, and safe operation.

Endorsement eligibility does not authorize operation of equipment that is otherwise prohibited by Illinois or federal vehicle-length and configuration laws.

How to study the Illinois CDL guide

Choose your correct license class. Determine whether your vehicle requires Class A, B, or C commercial privileges.
Identify all endorsements. List HazMat, Tank, Passenger, School Bus, or Doubles and Triples.
Study General Knowledge first. Build your foundation in inspections, speed, space, hazards, and emergencies.
Add Air Brakes when applicable. Learn the components, warning devices, pressure rules, leakage limits, and inspection sequence.
Add Combination Vehicles for Class A. Focus on coupling, trailer air systems, rollover prevention, off-tracking, and inspections.
Study endorsements separately. Keep HazMat, Tank, Passenger, School Bus, and Doubles and Triples in focused study sessions.
Practice by topic. Use missed questions to identify the exact study-guide section that needs review.
Prepare separately for skills testing. Practice the pre-trip inspection aloud, basic control maneuvers, and safe driving in a representative vehicle.

Illinois CDL preparation checklist

Read the current Illinois CDL Study Guide.
Confirm your CDL class and endorsements.
Prepare identity and residency documents.
Complete commercial self-certification.
Confirm whether medical certification is required.
Check whether ELDT applies.
Pass all required knowledge examinations.
Verify that your permanent CLP is received when required.
Hold the CLP for at least 14 calendar days.
Practice the pre-trip inspection aloud.
Practice basic control maneuvers.
Schedule the Illinois CDL skills and road test.

Related CDL Mastery guides

Last checked: July 18, 2026 Illinois CDL eligibility, fees, study-guide editions, medical procedures, testing locations, endorsements, and skills-test requirements can change. Verify all requirements directly through the Illinois Secretary of State before applying, scheduling, or testing.

Official Illinois CDL resources

This page is an independent educational resource and is not affiliated with the Illinois Secretary of State. It does not replace the current Illinois Commercial Driver’s License Study Guide, official Secretary of State instructions, instructor guidance, employer procedures, or applicable federal and state law.