CDL Combination Test – Written Exam Simulation

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Practice Test Instructions:

  • Choose the best answer and receive instant feedback.
  • Click next to go to the next question.
  • Check your results at the end.
  • Start a new version and keep studying!


Each test contains questions based on information in the official driver's handbook.

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Test your knowledge with this CDL written exam simulation.

Practice with more questions at once to get yourself ready for the real exam.

Be sure to study the Combination Vehicles sections (Section 6) of the official CDL handbook from your state as you prepare for the real thing. 

Need some more practice? Use our CDL Combination Vehicles practice test with instant feedback to help you study. 

Here’s what you need to know about your official Combination Vehicles knowledge exam:

  • Total Number of Questions: 20 questions.
  • Passing Score: 80% or 16 correct answers.
  • Number of Questions you can miss: 4 questions.
  • CDL Handbook Section to Study: Section 6 – Combination Vehicles
  • Combination Vehicles Test Required for: CDL drivers who want to operate commercial vehicles towing trailers.

Learn how to apply for a CDL and find the CDL manual for your state.

Visit your state’s official DMV website for more application information and to make testing appointments.

How many question is the combination test?

The CDL combination test consists of 20 multiple-choice questions.

How many questions can you miss on the CDL combination test?

You are allowed to miss up to 4 questions.

To pass the combination written test, you’ll need to answer 16 questions correctly and achieve a score of 80%.

What is a CDL Combination Vehicle?

A CDL combination endorsement is one of the most common endorsement CDL drivers will hold.

A combination vehicle is a truck/tractor unit with one or more trailers, more commonly referred to as a semi-truck or semi.

The trailers and the truck are connected by means of a fifth-wheel or converter dolly.

Combination trailers can take a variety of forms including flat trailers, enclosed trailers, tanks, and more.

Operating a combination vehicle requires different skills and knowledge than a straight truck, which is why you’ll need to pass both a combination knowledge test and a skills test in a combination vehicle in order to receive the endorsement.