CDL Commercial Drivers License General Knowledge Practice Test

Free 5-question sample test with instant feedback. See how ready you are.

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Sample Questions

Question 1

What is the primary purpose of performing a pre-trip vehicle inspection?

Answer: To ensure the vehicle is safe to drive before beginning a trip, identifying any defects that could cause an accident or breakdown.

Question 2

How often must a driver perform a vehicle inspection report?

Answer: At least once every 24 hours when operating a commercial vehicle.

Question 3

In the 7-step inspection method, what is the FIRST step a driver performs?

Answer: Approach the vehicle — check for damage, fluid leaks under the vehicle, and the overall condition before getting in.

Question 4

When inspecting the engine compartment, which fluid levels must a driver check?

Answer: Engine oil level, coolant level, and power steering fluid level must all be checked.

Question 5

What is the correct tire tread depth requirement for front tires on a commercial vehicle?

Answer: Front tires must have at least 4/32 of an inch of tread depth.