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Full Free General Knowledge CDL Practice Test

Use this free General Knowledge commercial drivers license practice test to prepare yourself to get your CLP (commercial learner's permit). To learn more about Roehl's paid CDL training, view our Get Your CDL page or apply now.

You can also use our General Knowledge CDL Practice Test Version 2 to simulate a CDL test at your local drivers licensing office.

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Question 1

While driving, where should you be looking ahead of your vehicle?





 
 

Question 2

What is the greatest amount of play that should be in your steering wheel?





 
 

Question 3

Which of the following is not a benefit of making plans when you spot a hazard?





 
 

Question 4

How many seconds does it take for a normal tractor-trailer to clear a double track?





 
 
 

Question 5

What is the main difference between aggressive driving and road rage?





 
 
 

Question 6

What action should you take when your vehicle begins to hydroplane?





 
 
 

Question 7

Which of the following are correct methods for knowing when you should shift up?





 
 
 

Question 8

The minimum tire tread depth for front tires is...





 
 
 

Question 9

An anti-lock braking system will...





 
 
 

Question 10

Which of the following can assist you with staying alert while you are driving?





 
 
 

Question 11

In which of the following circumstances should you make use of your vehicle's horn?





 
 
 

Question 12

You should inspect wheel bearing seals for...





 
 
 

Question 13

During which of the following situations should you have your emergency four-way flashing lights on?





 
 
 

Question 14

What is the method for testing hydraulic brakes for leaks?





 
 
 

Question 15

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





 
 
 

Question 16

Where should you place your warning devices if you must stop on a one-way or divided highway





 
 
 

Question 17

What is the best way to figure out how many seconds of following distance you have?





 
 
 

Question 18

You should place the starter switch key into your pocket while you are performing the pre-trip inspection because...





 
 
 

Question 19

What constitutes the proper braking technique in a vehicle that has anti-lock brakes?





 
 
 

Question 20

When performing a pre-trip inspection why is it a good idea to do it exactly the same way every time?





 
 
 

Question 21

What is the most important and obvious reason to always conduct a pre-trip inspection of your CMV?





 
 
 

Question 22

When stopped on a hill, what is the proper procedure to start moving without rolling back?





 
 
 

Question 23

Total stopping distance is a combination of...





 
 
 

Question 24

Why is it important to check before you transport a sealed load?





 
 
 

Question 25

Which of these are you not responsible for when it comes to your cargo?





 
 
 

Question 26

When a driver's blood alcohol concentration (BAC) rises, which of the following happens?





 
 
 

Question 27

Is it true that as long as the engine is not overheating it is completely safe to remove the radiator cap?





 
 
 

Question 28

Why should you limit the use of your horn?





 
 
 

Question 29

If brakes get wet, it can cause them to...





 
 
 

Question 30

What is the minimum number of tiedowns a flatbed load can have?





 
 
 

Question 31

While driving, the two main things a driver should look ahead for are...





 
 
 

Question 32

What might happen if you swing wide to the left before you turn right?





 
 
 

Question 33

Which of the following is true about over-width, over-length or over-weight loads?





 
 
 

Question 34

To avoid rollback when you start, you should...





 
 
 

Question 35

Which of the following is the most important reason for doing a pre-trip inspection?





 
 
 

Question 36

What are some of the important parts in the steering system?





 
 
 

Question 37

Which of the following are some suspension system defects?





 
 
 

Question 38

What is a Vehicle Inspection Report?





 
 
 

Question 39

What are the three types of emergency equipment you must have with your vehicle?





 
 
 

Question 40

Which of the following is the best way to see the rear and sides of your CMV?





 
 
 

Question 41

Two causes of tire fires include...





 
 
 

Question 42

What is the reason that placards are used?





 
 
 

Question 43

In safe driving, what does communicating mean?





 
 
 

Question 44

What can you do to avoid the effects that wet brakes can cause?





 
 
 

Question 45

When going down a long, steep downgrade, what factors determine your selection of a safe speed?





 
 
 

Question 46

What is the reason to be in the proper gear before starting down a hill?





 
 
 

Question 47

What are the three things related to cargo that drivers are responsible for?





 
 
 

Question 48

What is a pull-up?





 
 
 

Question 49

What should you check wheel bearings seals for?





 
 
 

Question 50

What is an escape ramp?





 
 
 


 
 
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