illinois
CDL Practice Test

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Welcome to the Illinois CDL Practice Test site. This is a free site and you are able to take the tests as a study guide as you prepare for the Illinois CDL test. The topics covered in these practice tests are taken from the Illinois CDL book. You will be presented with 40 questions and you must answer 34 questions correctly to pass. There is a 50-minute time limit. You may not go back once you answer a question. Click the "Start Test" button below to begin. 

1 / 40

When backing, what is the best method to use to avoid blind spots?

2 / 40

A shipment described on the Hazardous Waste Manifest may only be delivered to another _______ carrier or treatment facility, who then signs the ______, giving you a copy which you must keep.

3 / 40

Start by___when coupling.

4 / 40

What action should you take before driving while drowsy?

5 / 40

Remember to_____to prevent rollovers.

6 / 40

The method used to make sure the spring brakes will come on automatically is to:

7 / 40

Select the false statement about suspension:

8 / 40

What is most likely to occur when driving double and a set of trailer wheels goes into a skid?

9 / 40

Select the true statement about what the Air Compressor Governor controls:

10 / 40

The method for testing hydraulic brakes for leaks is to _____.

11 / 40

A leak rate for a straight truck or bus air brake system should not exceed _____psi per minute when the engine is off and the brakes are released.

12 / 40

At 55 miles-per-hour it takes about 6 seconds to stop a fully loaded truck and the braking distance is:

13 / 40

The shipping papers for hazardous materials can be found:

14 / 40

Where is compressed air stored?

15 / 40

Which of the following should you do when confronted by an aggressive driver?

16 / 40

Select the statement that describes smooth bore tanks:

17 / 40

What position should the heaviest trailer be in when pulling 3 trailers?

18 / 40

What is the reason that placards are used?

19 / 40

When a substance in the materials table is written in italics it means :

20 / 40

Which of the following is a clue another driver is impaired:

21 / 40

What should you hook up before backing a tractor to a trailer for coupling?

22 / 40

What is the purpose of the supply pressure gauge?

23 / 40

The brake pushrod should not move more than____for manual slack adjusters.

24 / 40

Select how you can tell if your vehicle is equipped with an anti-lock braking system:

25 / 40

Select what you should do before leaving the vehicle unattended:

26 / 40

The interlock system for the brake and accelerator on a transit coach may be used:

27 / 40

The blind spot behind the bus could extend to how many feet?

28 / 40

Students exit the bus and walk:

29 / 40

The basic description of a hazardous material includes the hazard class, the identification number, and the proper shipping name. Which one must appear first on the shipping paper?

30 / 40

You should activate hazard lights within approximately how many feet before railroad crossing?

31 / 40

If there is not a sight glass to check the oil level you are required to look for leaks around the _____.

32 / 40

What are the 3 methods for securing a second trailer before coupling?

33 / 40

What are the three hazard classes should NOT be loaded into a trailer that has a heater air conditioner unit?

34 / 40

The reason a bulk liquid tanker is hard to handle is:

35 / 40

There are 2 reasons as to why hauling liquids take special care. One reason is the ___center of gravity.

36 / 40

The trailer should be lowered so that _____.

37 / 40

For emergency braking when driving a double trailer and having to use your brakes to avoid a collision is to:

38 / 40

What is the main difference between a portable tank and a cargo tank?

39 / 40

Select the true statement about convex ("spot") mirrors.

40 / 40

How do you test your service brakes?

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CDL Category Practice Tests

CDL Practice Test

How To Get An illinois Commercial Drivers License

Applicants can apply for their CDL and any endorsements they wish at the age of 21 years old. Those under the age of 21, but over the age of 18 are eligible to receive an in-state only CDL. Those under 21 are not eligible for driving hazmat vehicles or transporting passengers. All applicants must supply a Department of Transportation (DOT) medical certificate and pass the CDL vision test in order to be qualified to receive their CDL. All applicants are required to pass a vision test, knowledge test(s), and a practical skills assessment in order to be considered for a CDL license.

Any applicant that is described by any of the sentences below is considered disqualified from getting their CDL.

  • A driver that has their commercial driving privileges revoked in another state.
  • Any driver convicted of driving impaired in a commercial vehicle in the past 24 months.
  • A driver that possess more than one driver’s license.
  • Any driver whose license is currently denied, canceled, suspended, or revoked.

Endorsements
L – Air Brake Restriction
X – Combination
P – Passenger
C – Charter Bus
T – Doubles/Triples
H – Hazardous Materials
S – School Bus
N – Tank

Hit the Open Road

illinois CDL License Test Tips

The written exam or knowledge test is required of all CDL applicants. This exam is comprised of 50 specific questions about commercial driving. Those applying for endorsements must complete an additional knowledge test for that endorsement. These tests are between 20 and 30 questions. Those who are applying for a Class A CDL must complete an additional 20 questions about combination vehicles. All knowledge tests must be passed with a grade of 80 percent or more for an applicant to receive their CDL permit.

The Illinois CDL skills assessment must be completed by an applicant. Each assessment includes a pre-trip inspection, basic control skills, and on-road driving test. The on-road driving test includes real-life driving instances, such as low clearance bridges, downgrading for a stop, increasing gears, curves, expressways, and other instances. These are mean to ensure the applicant is fully capable of driving a commercial vehicle safely.

Additional Information

Information on the Office of the Illinois Secretary of State

The Office of the Illinois Secretary of State is responsible for the administration of the CDL requirements and testing in Illinois. To get more information contact them via:

Website:  https://www.cyberdriveillinois.com/departments/drivers/drivers_license/CDL/cdl.html

Phone:  800.252.8980

 

Additional Illinois CDL Helpful Links

Please use the links below to access more valuable Illinois CDL testing resources and to learn more about practice driving tests for the state of Illinois.