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View All PlansFree IL CDL Double/Triple Trailers Practice Test 2025
- Perfect for first-time and renewal CDL/CLP applicants, and those adding endorsements
- Based on 2025 IL commercial driver's license manual
- Triple-checked for accuracy
- Updated for July 2025
If you’re looking to add the Double/Triple Trailers endorsement to your Illinois Commercial Driver’s License (CDL,) you’re probably aware that the main hurdle is passing a 20-question multiple-choice knowledge test. The test requires a score of 80% (or 16 correct answers) to pass. Once you’ve achieved this certification, you receive the valuable “T” endorsement on your CDL, which authorizes you to pull two or three trailers (where such laws allow) and operate combination vehicles that require this added skill and knowledge (Illinois CDL Handbook 2025).
In “The Prairie State” even with a Double/Triple Trailers endorsement, you’re only allowed to pull double trailers and the length of any cargo cannot exceed sixty feet by state law. But, make no mistake, this endorsement adds significant credibility and marketability to your transport status, increasing your employability and earning potential. You may be saying to yourself, “This sounds incredible! But how can I best prepare for the test?”
You will find no shortage of online resources, but too much information can be incredibly overwhelming. What you need is a systematic and focused approach. That’s where our online Illinois CDL Double/Triple Trailers practice test comes in. It is up to date as of July 2025 and includes 20 multiple-choice questions that resemble what you will face at the DMV on your actual test day!
As you take our online practice test, you will receive immediate and detailed feedback on your answers. If you get a question wrong, you are immediately shown why a different response is correct. This helps solidify the content in real time, instead of bombarding you with the entire assessment at the end.
Illinois only requires the passing of this knowledge test in order to add the “T” endorsement to your already existing Class A or Class B CDL. Once you have prepared, passed our free practice tests, and feel ready to go, you simply apply at the DMV, provide the required documentation, and, after passing the test, pay the required fee to add the endorsement to your CDL.
Looking for other Illinois-based CDL endorsements? Find tons of valuable information and practice tests here.
Interested in CDL endorsements for another state? We have you covered there as well! Browse our site and click CDL to select your choice of state.
- Perfect for first-time and renewal CDL/CLP applicants, and those adding endorsements
- Triple-checked for accuracy
What you need to know
What to expect on the actual IL DMV exam
questions
correct answers to pass
passing score
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Experience the Driving-Tests differenceList of questions (classic view)
- When you're pulling more than one trailer, which trailer should be the first one behind the tractor?
- Which of these statements about quick steering movements and doubles/triples is true?
- You are driving a 100-foot double trailer combination at 50 mph. The road is dry and visibility is good. You should keep at least ____ seconds of space ahead of you.
- Before connecting a converter dolly to a second or third trailer, you should check the height of the trailer. The trailer height is right if
- You are driving a 100-foot double trailer combination at 30 mph. The road is dry and visibility is good. You should keep at least ____ seconds of space ahead of you.
- With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. When you do this, you should hear
- Empty trucks
- Which of these statements about handling doubles and triples is true?
- Before you can supply air to the air tanks of a second trailer, you need to
- You are driving with double trailers and must use your brakes to avoid a crash. For emergency braking, you should
- How can you be sure that you supplied air to a second trailer?
- What is likely to happen if the pintle hook is unlocked while the dolly is still under the second trailer?
- You want to hook your combination to a second trailer that does not have spring brakes. To do this without wheel chocks, you should
- Which of these statements about managing space to the sides is true?
- The crack-the-whip effect that troubles trucks with trailers is most likely to tip over
- You are visually checking the coupling of a converter dolly to the rear trailer. How much space should there be between the upper and lower fifth wheel?
- You are pulling doubles. A set of trailer wheels goes into a skid. Which of the following is most likely to occur?
- You are doing a walk-around inspection of a double or triple trailer rig. You should be sure that the converter dolly air tank drain valves are ______ and the pintle hook is _______.
- A converter dolly is
- A converter dolly consists of a ______ wheel and ________ axles.