Illinois CDL Practice Test 2024 with Study Guide [PDF].

Illinois CDL Practice Test 2024 with Study Guide [PDF]. You can also Commercial Driver’s License (CDL) Written test and manuals with endorsement practice test in printable PDF.

Commercial drivers play a crucial role in ensuring the safe and efficient transportation of goods and passengers across the state of Illinois. To become a commercial driver, you must first obtain a Commercial Driver’s License (CDL) by passing the Illinois CDL Knowledge Test.

Illinois CDL Practice Test 2024 with Study Guide [PDF].

In this article, we will provide you with an in-depth understanding of the CDL Knowledge Practice Test and offer valuable tips to help you succeed in your journey to becoming a professional driver in Illinois.

Illinois CDL Practice Test 2024

Illinois Endorsements Practice Test 2024

Air Brakes Endorsement
Tests PDF Link
IL Air Brakes Test 1
IL Air Brakes Test 2
IL Air Brakes Test 3
Combination vehicles Endorsements
Tests PDF Link
Illinois CDL Combination vehicles Test 1
Illinois CDL Combination vehicles Test 2
Illinois CDL Combination vehicles Test 3
 Tank Endorsement Tank Endorsement

Illinois CDL Written Test

The Illinois Commercial Driver’s License (CDL) Written Test is an essential step toward obtaining a CDL and becoming a professional driver in Illinois. The test evaluates your knowledge of commercial driving regulations, vehicle operation, and safety protocols.

The Illinois CDL Written Test is a multiple-choice exam, and the number of questions varies depending on the type of CDL and endorsements you are pursuing. The General Knowledge Test, which is mandatory for all CDL applicants, consists of 50 questions. Additional endorsement tests, such as Hazmat, Air Brakes, and Passenger, may have 20-30 questions each. A passing score for each test is 80%.

Before obtaining a CDL, applicants must first obtain a Commercial Learner’s Permit (CLP) by passing a written knowledge test. The CLP allows you to practice driving commercial vehicles under the supervision of a licensed CDL holder.

After holding a CLP for at least 14 days, applicants must pass a Driving Skills Test, which includes a pre-trip vehicle inspection, basic vehicle control, and an on-road driving test. It is recommended to attend a CDL training program to prepare for the skills test adequately.

Commercial drivers must undergo a medical examination by a certified medical examiner listed on the National Registry of Certified Medical Examiners. The examiner will provide a Medical Examiner’s Certificate, which must be submitted to the Illinois Secretary of State’s office.

Test Name Illinois CDL Permit Test
Administered By Illinois Secretary of State
Purpose To get a Commercial learner’s permit
Total Questions: 50 on Road Rules and Road Signs
Question Type Multiple Choice
Passing Score 80% must answer at least 40 correctly to pass
Re-Take Allow
Time Limit 60 minutes
Minimum Age Applicants must be at least 18 years of age.

CDL classes in Illinois

  • Class A: A vehicles include tractor-trailers, truck and trailer combinations, and flatbeds with heavy loads.
  • Class B: vehicles include large buses, straight trucks, and dump trucks.
  • Class C: vehicles include smaller passenger buses and vehicles carrying hazardous materials.


In addition to these main classes, Illinois CDL holders can also obtain endorsements that allow them to operate specialized vehicles or transport specific types of cargo. These endorsements include:

  1. T – Double/Triple Trailers: This endorsement permits drivers to tow double or triple trailers.
  2. P – Passenger: This endorsement allows drivers to operate vehicles carrying 16 or more passengers, including the driver.
  3. N – Tank Vehicles: This endorsement authorizes drivers to operate tank vehicles designed to transport liquids or liquefied gases.
  4. H – Hazardous Materials: This endorsement allows drivers to transport hazardous materials requiring placards.
  5. X – Combination of Tank Vehicle and Hazardous Materials: This endorsement combines both N and H endorsements, allowing drivers to transport hazardous materials in tank vehicles.
  6. S – School Bus: This endorsement permits drivers to operate school buses designed to transport pre-primary, primary, or secondary school students to and from home, school, or school-related activities.

By obtaining the appropriate CDL class and endorsements, drivers in Illinois can legally operate a wide variety of commercial vehicles and transport various types of cargo.

Illinois CDL Study Guide

Preparing for the Illinois CDL Knowledge Practice Test requires dedication, patience, and persistence. By thoroughly studying the Illinois Commercial Driver’s License Study Guide, taking multiple practice tests, and following the tips outlined in this article, you will be well on your way to acing the practice test and ultimately obtaining your CDL. Remember, practice makes perfect, so keep working hard and stay confident in your abilities.