You need a Commercial Driver's License (CDL) to drive a bus, not a regular driver's license

A Commercial Driver's License, or CDL, is a separate license issued by your state specifically for driving buses and other large commercial vehicles. Your regular driver's license does not permit you to drive a bus, even if you have held it for decades. The CDL is required by federal law for anyone operating a vehicle designed to carry 16 or more passengers, including the driver.

The CDL comes in different classes depending on the size and type of vehicle you will drive. For buses, you will need either a Class B or Class A CDL, depending on whether the bus has a trailer or other attached vehicle. Most school bus and transit bus drivers hold a Class B CDL.

Getting a CDL takes longer than renewing a regular license. You will need to pass written tests, a skills test, and a medical examination. The entire process typically takes several weeks to a few months, depending on how quickly you study and schedule your tests.

Key Takeaways

  • A regular driver's license does not permit you to drive any bus; you must obtain a Commercial Driver's License from your state.
  • The CDL requires passing a written knowledge test, a skills driving test, and a Department of Transportation medical exam.
  • You must be at least 18 years old to hold a CDL within your state, or 21 if you plan to drive across state lines.
  • School bus drivers and transit bus drivers both need a CDL, though school bus drivers may need an additional school bus endorsement depending on your state.
  • Your state's DMV or equivalent agency handles CDL testing and issuance, and you can find the specific requirements on their website.

The difference between Class A and Class B CDLs

A Class B CDL allows you to drive a single bus without a trailer attached. This covers most school buses, city transit buses, and shuttle buses. The vehicle must be designed to carry 16 or more passengers. If you only ever drive a bus by itself, a Class B is what you need.

A Class A CDL allows you to drive a bus with a trailer attached, or any combination of vehicles totaling more than 26,001 pounds. Very few bus operations use trailers, so most bus drivers never need a Class A. However, if your employer operates articulated buses (buses with a connected trailer section) or if you might tow a trailer, you will need the Class A instead.

Check with your employer or the transit agency that would hire you to confirm which class they require. Most will tell you when ready whether you need Class A or Class B.

The written knowledge test for a CDL

Before you take the driving test, you must pass a written knowledge test at your state's DMV or testing center. The test covers traffic laws, vehicle safety, and safe driving practices specific to large vehicles. You will answer questions about braking systems, weight distribution, passenger safety, and how to handle emergencies.

For a bus, you will also take a Passenger Endorsement test, which covers rules specific to carrying passengers. This test asks about boarding procedures, how to information passengers with disabilities, what to do if a passenger becomes disruptive, and how to evacuate the bus in an emergency.

Most states allow you to study using a CDL manual published by your DMV. You can read it free from your state's DMV website or pick up a printed copy at an office. Many people study for two to four weeks before taking the written test. You can take the test as many times as needed, though you may have to pay a fee each time.

The skills driving test and what examiners watch for

After you pass the written test, you schedule a skills test with an examiner certified by your state. You will drive an actual bus under the examiner's observation. The test usually lasts 30 to 45 minutes and includes three parts: a pre-trip inspection, basic control skills, and on-road driving.

During the pre-trip inspection, you walk around the bus and point out safety features and potential problems. The examiner asks you to identify things like brake condition, tire wear, lights, mirrors, and emergency equipment. You do not need to fix anything — you just need to show you know what to look for.

The basic control skills portion happens in a closed course or parking lot. You will back up in a straight line, back up at an angle, and perform a lane change. These maneuvers test whether you can handle the bus's size and blind spots.

The on-road driving portion takes you onto regular streets. The examiner watches how you accelerate, brake, turn, merge, and respond to traffic. They are looking for smooth, safe driving and whether you check your mirrors frequently. You must follow all traffic laws and demonstrate that you can handle the bus safely around other vehicles and pedestrians.

The medical examination and what disqualifies you

You must pass a medical examination performed by a doctor certified to conduct Department of Transportation (DOT) exams. This is not your regular doctor — it must be someone on the DOT's list of approved medical examiners. Your state's DMV can tell you where to find one, or you can search the National Registry of Certified Medical Examiners online.

The exam checks your vision, hearing, blood pressure, and general health. The examiner will ask about any medications you take, past injuries, and medical conditions. Some conditions — such as certain heart problems, untreated diabetes, or severe sleep apnea — can disqualify you from holding a CDL. If you have a medical condition you are unsure about, ask the examiner before the exam whether it might be a problem.

The medical certificate lasts two years. You will need to renew it before your CDL expires, or your CDL will no longer be valid even if the license itself has not expired.

School bus endorsements and additional requirements

If you want to drive a school bus specifically, your state may require an additional School Bus Endorsement on top of your Class B CDL. This endorsement is not required in every state, so check with your state's DMV or with the school district that would hire you.

States that require the endorsement typically ask you to pass an additional written test covering school bus safety, student management, and evacuation procedures. Some states also require fingerprinting and a background check before you can transport students. School districts often have their own training requirements as well, separate from the state's CDL requirements.

If you are hired by a school district, they will tell you exactly what endorsements and certifications you need. Do not assume your CDL alone is enough — ask the district before you begin the CDL process.

How long the entire process takes and what it costs

The timeline from starting to study to holding your CDL typically ranges from four weeks to three months, depending on how quickly you prepare and how fast you can schedule tests. Some people study and test within four weeks; others take two or three months. Your state's DMV can tell you the current wait time for skills testing in your area, which varies by location and season.

Costs vary by state but generally include a fee for the written test (usually $10 to $50), a fee for the skills test (usually $50 to $150), and a fee for the medical exam (usually $75 to $200). Your state will also charge a fee to issue the CDL itself, typically $50 to $100. If you take either test more than once, you may pay the test fee again. Some employers cover these costs for new hires; others expect you to pay them yourself. Ask any potential employer about their policy before you start.

Where to start: your state's DMV website

Every state's DMV publishes its own CDL requirements, study materials, and testing procedures on its website. Start there to find the exact rules for your state, because requirements vary. Some states require a certain amount of classroom training before you can test; others do not. Some states test on computer; others use paper tests. Your state's website will have all of this information.

You can also call your state's DMV directly or visit an office in person. Staff can answer questions about which class of CDL you need, where to find a medical examiner, and how to schedule your tests. Many DMVs now allow you to schedule tests online, which can save you time.

Frequently Asked Questions

Can I drive a bus with a regular driver's license if I only drive it occasionally?

No. Federal law requires a CDL for any vehicle designed to carry 16 or more passengers, regardless of how often you drive it or whether it is your main job. There is no exception for part-time or occasional driving.

What happens if I drive a bus without a CDL?

You can be cited for operating a commercial vehicle without the proper license. Penalties vary by state but typically include fines of several hundred dollars and possible jail time. Your regular driver's license can also be suspended.

Do I need a CDL to drive a van that holds 15 passengers?

No. The CDL requirement applies only to vehicles designed to carry 16 or more passengers, including the driver. A 15-passenger van does not require a CDL. However, check your state's specific rules, as some states have additional requirements for vehicles carrying large groups.

Can I get a CDL if I have a DUI or other traffic conviction?

It depends on the conviction and your state's rules. Some convictions do not automatically disqualify you, but they may make it harder to pass the background check or to find an employer willing to hire you. Contact your state's DMV to learn how your specific conviction affects CDL may be able to access.

How often do I need to renew my CDL?

CDLs are typically valid for four or eight years, depending on your state. You will need to renew your medical certificate every two years, even if your CDL has not expired. If your medical certificate expires, your CDL becomes invalid until you renew it.