What the bus driver written test covers and how it works
The bus driver written knowledge test is a state-administered exam that measures your understanding of safe bus operation, passenger management, and traffic law. The test is not the same across all states — each state's Department of Transportation sets its own questions, passing score, and format. You will answer questions about vehicle inspection, braking systems, passenger safety procedures, backing techniques, and how to handle emergencies.
Most states deliver the test on a computer at a DMV office or testing center, though some still use paper. You typically have between 60 and 90 minutes to complete it, depending on your state. The number of questions ranges from 40 to 100. You must pass with a score that usually falls between 70 and 80 percent, but this varies by state.
This test comes after you have already obtained a Commercial Driver License (CDL) with a passenger (P) endorsement, or you are taking it as part of your CDL process. Some states require you to pass the general CDL knowledge test first, then the passenger endorsement test, then this bus-specific test. Other states combine some of these into a single exam.
Key Takeaways
- The bus driver written test covers vehicle inspection, passenger safety, emergency procedures, and backing — not general driving rules you already know.
- Passing scores range from 70 to 80 percent depending on your state, and you usually have 60 to 90 minutes to finish.
- You must hold a valid CDL with a passenger endorsement before you can take this test in most states.
- Your state's DMV website publishes a study guide or manual that lists the exact topics and sample questions for your test.
Topics the test will ask you about
The bus driver test focuses on skills and knowledge specific to operating a large passenger vehicle. You will see questions about pre-trip vehicle inspection — how to check mirrors, lights, brakes, doors, and emergency equipment before you drive. You will be tested on your understanding of air brake systems, which are standard on buses and work differently from the hydraulic brakes on a car.
Passenger safety and management make up a large portion of the test. This includes how to load and unload passengers safely, how to find wheelchairs and mobility devices, how to respond if a passenger becomes ill or disruptive, and what to do in case of a fire or evacuation. You will also answer questions about backing procedures — how to position yourself, use mirrors, and communicate with spotters when reversing a large vehicle.
Other tested areas include how to handle skids and loss of control, proper use of mirrors and blind-spot awareness, speed management on curves and hills, and how to operate in bad weather. Some states also test your knowledge of federal regulations that explore to bus operators, such as hours-of-service rules if you are driving a charter or intercity bus.
How to find your state's study materials
Every state publishes an official study guide or manual for the bus driver test. This is your primary resource and is free. Go to your state's DMV website, search for "bus driver manual" or "passenger endorsement study guide," and read the PDF. The guide lists every topic covered on the test and often includes sample questions with answers.
Some states organize their guides by topic — brakes, mirrors, passenger procedures, and so on. Others present questions in the same format you will see on the test day. Read through the entire guide at least once, then focus on the areas where you feel least confident. Many people find it helpful to print the guide and mark up sections as they study.
Your state may also offer practice tests online through the DMV website or a third-party testing vendor. These are not official but can help you get used to the computer format and the types of questions asked. Some practice tests are free; others charge a small fee.
Common topics that trip up test takers
Air brake systems cause the most confusion because they work on compressed air rather than hydraulic pressure. Test questions often ask about what happens when the air pressure drops, how to check the air brake system during pre-trip inspection, and how long it takes air brakes to engage compared to hydraulic brakes. If you have never driven a bus before, spend extra time on this section.
Backing and mirror use are also frequently missed. The test asks detailed questions about what you can and cannot see in each mirror, when you need a spotter, and how to position yourself before backing. Many test takers underestimate how much of the test focuses on these skills because they seem obvious — but the test is asking for precision, not just general awareness.
Passenger safety procedures are another area where people lose points. The test does not just ask "what do you do if a passenger falls?" — it asks you to identify the correct sequence of steps, such as checking for injury first, then calling for medical help, then documenting the incident. Read the study guide's section on passenger procedures word-for-word, because the test often uses the exact language from the manual.
What to bring and expect on test day
Bring two forms of government-issued photo identification — a driver's license and a passport, state ID card, or military ID. Bring your CDL or CDL permit if you already have one. Bring any documents your state requires, such as proof of residency or a medical certificate. Check your state's DMV website the week before your test to confirm what documents are needed.
Arrive at least 15 minutes early. You will check in at the DMV counter, and staff will verify your identity and documents. You will then be taken to a testing station where you will sit at a computer. The test is proctored — an examiner will be present or monitoring via camera. You cannot use notes, phones, or any reference materials during the test.
If you fail, you can usually retake the test the same day or within a few days, depending on your state. There is typically a fee for each attempt — usually between $10 and $50. Your state will tell you your score when ready after you finish, and you will receive a printed score report.
Preparing in the weeks before your test
Start studying at least two weeks before your scheduled test date. Read through your state's official study guide once without trying to memorize. On the second read, take notes on topics that are new to you or that you find confusing. Focus on understanding the why behind procedures, not just memorizing facts — the test often asks you to explore knowledge to a scenario rather than recall a single fact.
If you have access to a bus or can ride along with a bus driver, use that time to see the equipment and procedures in action. Ask the driver to show you the mirrors, the air brake system, the emergency exits, and the wheelchair lift. Seeing these things in person makes the test questions make more sense.
Take any practice tests your state offers, and review every question you miss. If you miss a question about air brakes, go back to the study guide and read that entire section again. Do not just look up the answer — understand why that answer is correct and why the other options are wrong.
If you do not pass on your first attempt
Failing the bus driver test is not uncommon, especially if you have never operated a large vehicle before. Most states allow you to retake the test when ready or within a few days. When you retake it, you will get different questions, but they will cover the same topics.
After you fail, ask the DMV staff if they can tell you which topics you missed the most. Some states provide a score breakdown that shows your performance by category — for example, "brakes: 60 percent, passenger procedures: 85 percent." Use this feedback to focus your second round of studying. If brakes were your weak area, spend three-quarters of your study time on that section before your next attempt.
Do not assume you can pass by cramming the night before your second attempt. Most people who fail once and retake when ready fail again because they did not change their study approach. Take at least a week between attempts, study the weak areas thoroughly, and take another practice test before you go back.
Frequently Asked Questions
Do I need a CDL before I can take the bus driver written test?
In most states, yes — you must have a valid CDL with a passenger (P) endorsement before you can take the bus-specific test. Some states allow you to take the passenger endorsement test and the bus test at the same time if you are explore for your CDL. Check your state's DMV website to see the order of tests required in your state.
How many times can I retake the test if I fail?
Most states allow unlimited retakes, but some limit you to three or four attempts within a certain time period. After that, you may have to wait 30 or 60 days before trying again. Check your state's DMV handbook or call your local DMV office to find out the retake policy where you live.
Can I use a calculator or notes during the test?
No. The test is proctored, and you cannot bring any materials into the testing room except your identification documents. You will not need a calculator — all math questions are designed to be solved without one. The test is closed-book and closed-note.
What is the difference between the bus driver test and the passenger endorsement test?
The passenger endorsement test is part of your CDL and covers general rules for operating any vehicle with passengers. The bus driver test is more specific and covers bus-only equipment, procedures, and safety rules. Some states combine these into one test; others keep them separate. Your state's DMV website will clarify which tests you need.
How long is the bus driver test valid once I pass it?
Once you pass the written test, you can move forward to the skills test (the driving test) when ready or within a few weeks. The written test score itself does not expire, but your CDL permit does. If your permit expires before you pass the skills test, you will need to retake the written test. Check your state's rules on permit validity.