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General Knowledge Practice Test 2

Last updated on May 5, 2023

This General Knowledge Practice Test 2 contains general knowledge and safe driving information that all commercial drivers should know to successfully pass the CDL “General Knowledge” written test.

General Knowledge Practice Test #2 Methods:

Number of practice test questions with answers: 50

Number of correctly answered practice test questions needed to pass: 40

Passing score: 80%

This CDL General Knowledge Practice Test #2 with Answers is applicable for all 50 States.

General Knowledge Practice Test #1

CDL General Knowledge Practice Test (#2) With Answers:



#1. Wet brakes can cause all of the following, EXCEPT:

#2. How do antilock brakes systems (ABS) help you?

#3. How far ahead should you look when driving?

#4. If you are asked to haul a placarded load and you do not have a hazardous materials endorsement on your CDL, you should:

#5. All of the following are examples of road hazards, EXCEPT:

#6. When backing, what is the most important hand signal that you and the helper should agree on?

#7. Which of the following can cause tire fires?

#8. If you find that you are being tailgated, you should:

#9. Which of the following is a situation where legal maximum weights may not be safe?

#10. Entry-Level Driver Training (ELDT) is required for obtaining all of the following CDL endorsements for the first time, EXCEPT:

#11. What is a good rule for managing the space ahead of your vehicle when travelling under 40 mph?

#12. Stopping is NOT always the safest thing to do in an emergency.

#13. Which of the following is NOT a true statement about vehicle inspections:

#14. What factors determine your selection of a “safe” speed when going down a long, steep downgrade?

#15. Where should you place emergency warning devices when stopped on a one-way or divided highway?

#16. Which of the following statements about alcohol is true?

#17. All of the following should be considered if you must drive in foggy conditions, EXCEPT:

#18. What causes most front-wheel skids?

#19. Dry bulk tanks require special care because they _________ and the load can shift.

#20. The four basic types of retarders are:

#21. If engine coolant has to be added to coolant system that does not have an overflow or recovery tank, you should do all of the following, EXCEPT:

#22. What three things add up to total stopping distance?

#23. How long does it take for a typical tractor-trailer unit to clear a double railroad track?

#24. All of the following are ways to eliminate in-vehicle distractions, EXCEPT:

#25. What is the distance you can see ahead of your vehicle with low beams?

#26. All of the following are suspension system defects, EXCEPT:

#27. In the event of an accident, you should remember to do the following EXCEPT:

#28. Which of the following things related to cargo are drivers responsible for?

#29. Which of the following is a proper braking technique when going down a long, steep downgrade?

#30. When changing lanes, you should do all of the following, EXCEPT:

#31. What is “sleep debt”?

#32. A driver must notify their employer within 30 days of a conviction for any traffic violations (except parking) while operating what type of vehicle?

#33. What is “black ice”?

#34. Antilock braking systems (ABS) are defined as a ____________ system that prevents the wheels from locking up during hard braking applications.

#35. Commercial motor vehicles (CMVs) must be equipped with all of the following types of emergency equipment, EXCEPT:

#36. Which of the following is NOT a cause of vehicle fires?

#37. A “pull-up” is defined as straightening and repositioning your vehicle when backing a trailer by pulling forward as often as necessary.

#38. Which of the following types of commercial motor vehicles (CMVs) can get stuck on a railroad-highway crossing?

#39. When should you make mirror adjustments?

#40. All of the following should be given extra attention during your vehicle inspection before driving in the winter, EXCEPT:

#41. What is the minimum number of tie-downs for a 20-foot load?

#42. All of the following are key steering system parts, EXCEPT:

#43. An engine retarder is designed to:

#44. Which of the following does NOT need to be included on an Individual Vehicle Distance Record (IVDR)?

#45. A “hazard” is defined as any road user or road condition that is a possible danger.

#46. Which of the following is NOT a basic vehicle control skill required to safely operate a commercial motor vehicle (CMV)?

#47. When driving at night, you should use low beam headlights whenever you can.

#48. During a trip, all of the following critical items should be checked whenever you stop, EXCEPT:

#49. If you have two (2) violations of an out-of-service order within a ten (10) year period while transporting nonhazardous materials, how long will you lose your CDL for?

#50. Which of the following statements about backing a commercial motor vehicle (CMV) is NOT true?


General Knowledge Practice Test #1


The pool of questions used to produce this practice test have been independently created by CDL Digest and come directly from Code of Federal Regulations (Title 49 – Transportation) and the information provided in AAMVA’s “2005 CDL Test System (July 2010 or newer Version) Model Commercial Driver Manual”.

These are the same sources that all 50 State Driver Licensing Agencies (SDLA) are required to use by federal regulation (49 C.F.R. 383.133) to develop the pool of questions for all written tests needed for a person to obtain a commercial learner’s permit (CLP), commercial driver’s license (CDL), and/or any federally authorized endorsements.

Note: The above listed source information is static, meaning changes to the pool of questions that your State Driver Licensing Agency (SDLA) uses for the actual written test have been extremely rare over the decades. Do to the static nature of the source information, you may see practice test questions and answers in this practice test that are very similar, if not identical to the questions and answers on the actual written test. If this occurs, it is purely coincidental. CDL Digest is not affiliated with the AAMVA or any government agency.


The source material used by CDL Digest to develop these practice test questions is very technical. Relying solely on the practice tests we have produced will not be enough to successfully pass the actual written tests. You will NEED to study in order to successfully pass these practice tests and the actual written tests.

Class “A” Commercial Learner’s Permit Study Guide

Class “B” Commercial Learner’s Permit Study Guide

Complete CDL Study Guide

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