Want to drive doubles and triples do you? Well, to make that dream a reality you first need to pass this endorsement test which will demonstrate that you have the knowledge to drive these large vehicles safely.

Driving doubles and triples is one of the harder things to do when it comes to commercial truck driving so it should be no surprise that this endorsement test is no “walk in the park.” You will be required to show mastery of a variety of important subjects on this test which we will cover in greater detail later in this test preview.

For now, just know that this is one of several endorsement tests that can be included in the Commercial Drivers License testing process. Tests you are required to take depend on whether you are seeking a Class A, B or C commercial driver’s license as well as the specific type of vehicle you plan to drive.

Now let’s take a closer look at the content of the doubles and triples test so that you can be fully prepared to pass when you visit the DMV.


Test Overview

There are a total of 20 questions on this endorsement test. Each question is presented in multiple choice format and you need to answer at 16 questions correctly in order to pass. That means you need a score of 80% or higher.  

Before going to the DMV to take this endorsement test please be sure to do all of the following first:

  • Check your test eligibility. Most states require applicants to be at least 18 years of age or 21 if they want to drive interstate (across country, from state to state). Applicants must also have a valid driver’s license.
  • Determine what identification materials you will need to bring with you to take the test.
  • Determine the fees you must pay and acceptable payment methods.

You should be able to find all of this information on your state’s DMV website. One more thing – you should seriously consider making an appointment at your DMV to avoid a lengthy wait time.

What’s on the Test?

This endorsement test deals with the safe operation of doubles and triples. You will see questions on such subjects as pulling doubles and triples, inspecting doubles and triples and conducting an air brake check on doubles and triples.

You should also see questions on properly turning and backing these behemoth vehicles and much more.

Coupling and uncoupling trailers is also another important subject that is sure to be covered on the test. Be sure you know how to couple a trailer including connect the emergency line, charge the trailer air tank and then disconnect the emergency line to set the trailer emergency brakes. Also, remember that for safest road handling, a more heavily loaded trailer should be in first position behind the tractor – lighter trailers go in the rear.

Here are some examples of the types of questions that you will find on this endorsement exam:

  • Should you disconnect the pintle hook when the dolly is under the rear trailer?
  • What is the first step in connecting the convertor dolly to the front trailer?
  • If a second trailer doesn’t have spring brakes how should you set the brakes when coupling?
  • What is rearward amplification?
  • How do you check that there is sufficient airflow between all trailers in a triple?

Keep in mind that each question on this test multiple choice. There will be four possible answers and you will need to select the right one.


How to Prepare for the Test

Step one in preparing for your doubles and triples endorsement exam is to study that section of your state’s commercial driver’s license handbook. You should also study the combination vehicles section to further increase your knowledge.

You should read these sections again and again and try to really come to understand the content. Make sure you know the unique coupling and uncoupling procedures when dealing with doubles and triples. Make sure you understand braking and backing so that you can answer questions on these subjects quickly and easily.

Step two in preparing to pass the doubles and triples endorsement exam is to take practice tests like the ones we offer here to assess your knowledge.

These tests are a great way to identify your strengths and weaknesses so that you can really focus your studies and learn all the content you need to pass.  

The practice tests we offer here are modeled after the real doubles and triples endorsement exam and will prepare you not just for what is covered on the test but also for the experience of taking the exam. After taking these tests you should feel more comfortable and confident when going to the DMV.

Test Taking Tips – Improve Your Chances to Pass

Get a good night’s sleep before the test! That’s one highly underrated thing that you can do to perform better on the test. We simply think better when we are rested. Also be sure to eat a good meal before going to the DMV. Food is fuel and your brain will need all the fuel it can get as it is called upon to answer the questions on this endorsement exam.

When taking the test keep in mind that the old belief that you should always go with your first instinct when it comes to answer to a multiple choice question has been shown to be false! Studies show that revisions have a higher chance of being right than your first choice.

So if you have a question that are struggling with and at first you think it is one answer but then you change your mind and believe another answer is right don’t be afraid to go ahead and change your selection – you just might be increasing your odds of getting it right!



There is no magical solution when it comes to passing the doubles and triples endorsement test. The best way to pass this test is simply through hard work. In other words, you have to put in the study time.

Build your knowledge by studying the state CDL handbook and then test that knowledge and increase your confidence by taking practice tests like the ones we offer here. If you do that you’ll be able to earn your endorsement, which could allow you to qualify for higher paying driving assignments.