What an endorsement test is

An endorsement test is a written exam the DMV gives you when you want to add a specific endorsement to your commercial driver's license. It tests your knowledge of the rules and safety practices for that particular type of driving — whether that's hauling hazardous materials, operating a tanker truck, or transporting passengers.

You take the test after you have already passed your CDL general knowledge test and your air brake test (if required). Each endorsement has its own separate test, so if you want both a hazmat and a tanker endorsement, you will take two different exams.

The test is multiple choice, usually 20 to 30 questions depending on your state, and you need to score at least 80 percent to pass. You take it at your local DMV office, and most states let you retake it the same day if you fail.

Key Takeaways

  • Each endorsement requires its own written test covering the rules and safety practices specific to that type of commercial driving.
  • You must pass your general CDL knowledge test and air brake test before you can take an endorsement test.
  • Endorsement tests are typically 20 to 30 multiple-choice questions, and you need to score at least 80 percent to pass.
  • You can study using your state's CDL manual, which has a separate section for each endorsement, and most states offer free practice tests online.
  • After you pass the written test, you may need to pass a skills test or provide additional documentation before the endorsement is added to your license.

Which endorsements require a test

Not every endorsement requires a written test — some require only a skills test or a background check. The endorsements that require a written test are the ones that demand specialized knowledge about cargo, equipment, or passenger safety.

Hazmat (H) requires a written test covering regulations for transporting hazardous materials, placarding rules, and emergency procedures. Tanker (N) requires a test on the physics of liquid cargo, tank compartment rules, and safe braking with a shifting load. Passenger (P) requires a test on passenger safety, seating rules, and emergency evacuation procedures. Double/Triple Trailers (T) requires a test on coupling and uncoupling procedures, weight distribution, and handling longer combinations.

Other endorsements like School Bus (S) and Motorcycle (M) may require a skills test instead of or in addition to a written test, depending on your state. Check your state's CDL handbook to confirm which endorsements require which tests.

How to study for an endorsement test

Your state's CDL manual is the primary study resource. It contains a dedicated section for each endorsement, and the test questions come directly from the material in that section. You can read the manual free from your state DMV website, or pick up a printed copy at your local DMV office.

Read through the endorsement section carefully, paying attention to bolded terms, numbered lists, and any diagrams or charts. Take notes on the topics that seem most important — regulations, safety procedures, and equipment rules are tested more heavily than background information.

Most states offer free practice tests online through their DMV website. These practice tests use the same format and question style as the real test, so taking them multiple times helps you get comfortable with how the questions are worded. Aim to score 85 to 90 percent on practice tests before you schedule your real test.

What happens on test day

Bring your current CDL, a valid photo ID, and any documents your state requires (such as proof of residency). Arrive at least 15 minutes early so you have time to check in and answer any questions about the testing process.

You will be taken to a testing station, usually a computer terminal, where you will answer the multiple-choice questions. You have a set amount of time — usually 30 to 60 minutes depending on the endorsement — to complete the test. You can go back and change your answers before you submit.

Once you submit, you will see your score when ready. If you pass, the DMV will tell you what happens next — whether you need to schedule a skills test, provide additional paperwork, or wait for your new license to be printed. If you fail, you can usually retake the test the same day or schedule another appointment within a few days.

After you pass the written test

Passing the written test does not automatically add the endorsement to your license. Depending on the endorsement, you may need to complete additional steps before it is official.

For hazmat, you must pass a background check and fingerprinting through the Transportation Security Administration (TSA). This can take several weeks. For passenger and school bus, you typically need to pass a skills test where an examiner watches you perform specific driving tasks. For tanker and double/triple trailers, some states require a skills test; others do not.

Your DMV will explain what you need to do next when you pass the written test. If you are unsure, ask the testing staff before you leave — they can tell you exactly which documents to bring and which office to visit for the next step.

Retaking an endorsement test

If you do not pass on your first try, you can retake the test. Most states let you retake it the same day, though some require you to wait a few hours or come back another day. There is usually a fee for each attempt, though the cost varies by state.

Before you retake the test, go back to the study materials and focus on the topics you struggled with. If you scored in the 70s, you were close — often just a few more correct answers will get you to 80 percent. If you scored much lower, spend more time on the manual and take the practice test again before scheduling your next attempt.

Most people pass on the second or third try. Do not rush back to the test center the same day unless you feel confident you know the material better. A few extra days of study usually makes the difference.

Frequently Asked Questions

Can I take multiple endorsement tests on the same day?

Yes. If you want both a hazmat and a tanker endorsement, you can take both tests in one visit to the DMV. You will take them back-to-back or with a short break between them. This can save you time if you are pursuing multiple endorsements.

What if I fail the hazmat test but pass the tanker test?

Each endorsement test is separate, so you can pass one and fail another. The tanker endorsement will be added to your license (after you complete any required skills test), and you can retake the hazmat test whenever you are ready. You do not have to pass all endorsement tests at once.

Do I have to take an endorsement test if I already have the endorsement in another state?

No. When you transfer your CDL from another state, your endorsements transfer with it. You will not have to retake the endorsement tests. You will need to pass your new state's general knowledge test and any state-specific requirements, but not the endorsement tests themselves.

How long does it take to get the endorsement added after I pass the test?

For most endorsements, it takes a few days to a few weeks. Hazmat takes the longest because of the TSA background check, which can take 4 to 6 weeks or longer. For passenger and school bus, it depends on how quickly you can schedule and pass the skills test. Your DMV will give you a timeline when you pass the written test.

Can I study for the endorsement test using online courses instead of the manual?

Online courses can help you understand the material, but the official CDL manual is what the test is based on. Use the manual as your primary source and supplement with online courses if you want extra explanation or practice questions. The manual is free and covers everything you need to know.