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Practice test 4 of 10

Illinois CDL — General Knowledge Practice Test 4

The Illinois CDL — General Knowledge knowledge test has ~50 questions; you need ~40 correct (80%) to pass.

This practice test follows that format: 50 questions, pass with 40 correct. Answer every page, then grade it to see the answers and explanations.

Questions 1–10 of 50

  1. 1.What does it mean when a yellow ABS malfunction lamp on the dash stays lit?
  2. 2.Why should you avoid quick moves when a vehicle is following you too closely?
  3. 3.Why does everything look smaller when viewed in a convex (curved) mirror?
  4. 4.At dawn, dusk, or in rain or snow, what should you turn on to be seen?
  5. 5.Why are railroad crossings with steep approaches a special concern for long, low vehicles?
  6. 6.Driving a commercial vehicle with any amount of an illegal drug or cannabis in your system results in what minimum penalty?
  7. 7.What most often causes a front-wheel skid?
  8. 8.In cold weather, why is carbon monoxide from a leaking exhaust especially dangerous?
  9. 9.What should be the main way you control your speed when going down a long, steep grade?
  10. 10.How does the following-distance rule change once you are traveling above 40 mph?

0 of 50 answered