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  • Updated for October 2024
  • Based on 2024 IL commercial driver's license manual

Free Illinois CDL Combination Practice Test 2024 | IL

Driving combination vehicles can be an integral part your commercial driving career. Before you can reach that point though, you’ll need to pass an exam from your local branch of the Illinois DMV showing that you’ve mastered the specialized knowledge necessary to drive these vehicles safely. The following 30 questions are from the official 2024 Illinois CDL Manual, and cover just combination vehicles to help you prepare for this specific DMV test. Good luck both now on the practice exam and on your real exam when the time comes!

  • Perfect for first-time and renewal CDL/CLP applicants, and those adding endorsements

What you need to know

9 min to complete
Available in EN and ES
Verified by Steven Litvintchouk, M.S., Chief Educational Researcher, Member of ACES. See our detailed commitment to accuracy and quality in our practice tests.

What to expect on the actual IL DMV exam

20

questions

16

correct answers to pass

80%

passing score

List of questions (classic view)

  1. What is the proper following distance for a 90-foot vehicle traveling at 50 mph?
  2. You do NOT need to drive slowly to avoid a rollover on
  3. Which of the following is NOT part of stopping a trailer skid?
  4. What does the crack-the-whip effect cause?
  5. Since what year have trucks been required to have antilock brake systems (ABS)?
  6. What is the proper following distance for a 60-foot vehicle traveling at 30 mph?
  7. What percentage of truck driver deaths in crashes are the result of truck rollovers?
  8. Which of the following is NOT a step in backing your trailer?
  9. What is the first step in coupling a tractor-semitrailer?
  10. Which of the following is NOT true about an antilock braking system (ABS)?
  11. Which of the following makes a rollover more likely?
  12. Which of the following off-tracks the most?
  13. Which of the following is NOT a part of inspecting the fifth wheel?
  14. Which of the following is NOT a part of raising the landing gear?
  15. What will happen if air doesn't flow all the way to the back?
  16. Which of the following are likely to get stuck at a railroad crossing?
  17. Which of the following is NOT part of inspecting the sliding fifth wheel?
  18. Compared with a regular five-axle tractor-trailer, how much more likely is the final trailer of a triple to roll over?
  19. What is the usual range at which the trailer air supply knob will pop out?
  20. Which of the following is part of securing the tractor?
  21. Trucks built since 1975 usually have
  22. What should you do if your vehicle gets stuck at a railroad crossing?
  23. Which of the following is NOT part of a trailer air line system?
  24. Which of the following is NOT part of testing the trailer's service brakes?
  25. If you must back along a crooked path, which side should you back toward?
  26. Loss of air pressure in the emergency line causes
  27. Which of these statements is true?
  28. If you cannot make a right turn without swinging into another lane, what should you do?
  29. If there is a major leak in the _________, the tractor protection valve will close and the trailer emergency brakes will come on.
  30. The rear wheels of which vehicle will off-track the most?
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