Free Illinois CDL General Knowledge Practice Test 2023

You are looking for actual practice for your coming CDL test? So you have come to the right place. Our IL General Knowledge Practice Test has the same questions as the real exam which is based on the Illinois CDL manual. Our CDL practice test covers most of the subject areas on the Illinois General Knowledge Test such as shifting techniques, railroad crossing safety, drunk driving laws, and much more to make you become a safer driver. In addition, each question has a detailed explanation that will help you understand the concept and answer future questions about it correctly. If you don't get the pass right away, don't worry, you can take this practice test an unlimited number of times to make sure you learn all the questions. Our Illinois CDL Practice Test will refine your driving knowledge so you can earn your CDL and start driving on the roads. Let’s take our practice test now!

Our CDL practice tests:
Based on 2021 IL commercial driver's license manual
Full answers + detailed explanations
Perfect for first-time, renewal applicants
IL CDL General Knowledge Test format:
50 questions
40 correct answers to pass
80% passing score
List of questions
Void filler is:
Which of these statements about managing space to the sides is true?
You are checking your tires for a pre-trip inspection. Which of these statements is true?
How many red reflective triangles are you required to carry?
The purpose of the retarders is to:
Which of these is true about driving in a tunnel?
Placing a phone call while driving:
Which statement is true about extending the 14 hour on duty clock by using the 8 hour sleeper berth provision?
Whenever you double your speed, your vehicle has about how many times of destructive power if it crashes?
The maximum safe weight that a tire can carry is:
Which of these is not a brake check you normally do during your walk-around inspection?
All lights and reflectors should be operating properly, clean, and:
Which of these is correct about emergency or evasive action?
In case of illness that prevents you from driving safely, you should:
Which of these is true about hazardous materials:
When loaded cement pipe over 45 inches in diameter, which pipes should be blocked, wedged, or otherwise immobilized?
A single metal coil with eye vertical weighing 6,350 lbs requires tiedowns with a minimum aggregate WLL of:
How many tiedowns are required on a stack of shortwood loaded crosswise?
Which statement below is true?
A female housing fixed to the side or ends of a vehicle to receive a stake or peg, and may also be used as an anchor point is a:
All of the following are key parts of the steering system except:
What is the main factor affecting the low-speed offtracking of a tractor trailer?
You receive a scale ticket and your drive axles are 35,700 and your trailer tandems are 30,600. Based upon a trailer with 4 inch slider rail hole spacings, what is the minimum number of holes you would have to slide the tandems to get the weight legal, and what would the final weights be?
Overweight, oversized loads:
A device placed between the deck of a vehicle and car or between articles of cargo, intended to provide greater friction than exists naturally between these surfaces is:
Securing heavy vehicles or equipment with crawler tracks or wheel requires a minimum of how many tiedowns?
What is the minimum securement requirement for paper rolls with eyes vertical with a width between 1.25 and 1.76 its diameter?
You should try to park so that:
A waterproof sheet used to cover cargo is a:
When loading paper rolls with eyes horizontal, which of the following is not a requirement for stacking a second layer?
You are driving a heavy vehicle with a manual transmission. You have to stop the vehicle on the shoulder while driving on an uphill grade. Which of these is a good rule to follow when putting it back in motion up the grade?
Some large trucks have curved mirrors. These mirrors:
In the following picture, what are axles 2 and 3 commonly referred to as?

Which of these would NOT help if windshield is covered with ice?
Under the adverse driving conditions exception, how many additional hours can you drive?
Which of the following has the greatest affect on the gross vehicle weight?
Which of these statements about overhead clearance is true?
A DUI conviction for a CDL-holder will result in disqualification for a minimum of:
The basic control skills exam allows for a maximum of how many points scored?
To avoid a crash, you had to drive onto the right shoulder. You are now driving at 40 mph on the shoulder. How should you move back into the pavement?
Which of the following techniques will not change the weight distribution across your axles?
A device placed on the exposed edge of an article to distribute tiedown forces over a larger area of cargo than the tiedown itself, to protect the tie-down and/or cargo from damage, and to allow the tiedown to slide freely when being tensioned is a:
Using the following numbers, what would be the final result if you moved the 5th wheel forward two holes?

steer axle: 10,800 pounds
drive axles: 34,100 pounds
Weight transfer: 500 pounds per hole
You receive a scale ticket and your drive axles are 35,400 and your trailer tandems are 31,100. Based upon the two most common tandem slider rail hole spacings, what is the minimum number of holes you would have to slide the tandems to get the weight legal, and in which direction?
Which of the statements about an inspection of the suspension components is true?
It is safe to remove the radiator cap or any other part of the pressurized system:
Oil, coolant, charging circuit warning lights should go out:
When driving downhill, you should use the service brakes:
When securing paper rolls with eyes vertical in a sided vehicle all of the following are acceptable except:
Submitting fingerprints for a background check will be required for drivers applying for: