Endorsements are permissions added to your driver's license that let you operate specific types of vehicles or carry certain cargo
An endorsement is a notation on your commercial driver's license (CDL) that says you are legally allowed to drive a particular class of vehicle or haul a particular type of cargo. Without the right endorsement, you cannot legally operate that vehicle, even if you have a CDL. Endorsements are not optional upgrades — they are legal requirements tied to what you drive and what you carry.
For example, if you want to drive a tanker truck carrying liquid, you need a Hazmat endorsement and a Tanker endorsement. If you want to drive a bus with air brakes, you need a Passenger endorsement and an Air Brake endorsement. Each endorsement requires you to pass a written test specific to that endorsement, and some require a skills test as well.
Endorsements appear on your license as letters or codes. The exact codes vary by state, but they follow a federal standard so that law enforcement and employers across the country understand what you are authorized to do.
Key Takeaways
- Endorsements are legal permissions that allow you to operate specific vehicle types or carry certain cargo; driving without the required endorsement is illegal.
- Common endorsements include Passenger (P) for buses, Tanker (T) for tank vehicles, Hazmat (H) for hazardous materials, and Doubles/Triples (D) for multiple trailers.
- Each endorsement requires passing a written test, and some require a skills test or medical certification before you can add it to your license.
- You can add endorsements to an existing CDL by visiting your state's Department of Motor Vehicles and paying a fee, which varies by state and endorsement type.
- Employers often require specific endorsements for certain jobs, so knowing which endorsements you need before you explore for a position can speed up hiring.
The most common endorsements and what they allow you to do
Passenger (P) endorsement allows you to drive a bus carrying 16 or more people, including the driver. This includes school buses, transit buses, and charter buses. You must pass a written test on passenger safety, loading procedures, and emergency evacuation.
Tanker (T) endorsement allows you to drive a vehicle with a tank permanently attached or a portable tank that holds liquid cargo. This includes milk tankers, fuel tankers, and water tankers. The test covers tank vehicle handling, weight distribution, and cargo-specific safety rules.
Hazmat (H) endorsement allows you to transport hazardous materials — chemicals, explosives, radioactive materials, and other dangerous goods. This is the most heavily regulated endorsement. You must pass a written test and a background check. The federal government maintains a list of people who are prohibited from holding a Hazmat endorsement, including people with certain felony convictions.
Doubles/Triples (D) endorsement allows you to pull two or three trailers at once. You must pass a written test on coupling and uncoupling procedures, weight distribution, and handling multiple trailers.
Air Brake (L) endorsement is required if you drive a vehicle with air brakes and you want to operate it in all states. Some states allow you to drive air brake vehicles without this endorsement but restrict you to that state only. The test covers air brake systems, inspection, and emergency procedures.
School Bus (S) endorsement is required to drive a school bus. You must pass a written test and a skills test. Many states also require fingerprinting and a background check.
How to add an endorsement to your existing CDL
To add an endorsement, visit your state's Department of Motor Vehicles in person. You cannot add most endorsements online or by mail. Bring your current CDL, proof of residency, and payment for the endorsement fee. The fee varies by state and endorsement type — some states charge $5 to $10 per endorsement, while others charge $25 or more.
Next, you will take a written test at the DMV. The test covers the specific rules and safety procedures for that endorsement. Most tests are 20 to 50 questions and you must pass with a score of 80 percent or higher. You can usually take the test the same day you explore, though some DMVs require you to schedule an appointment.
For some endorsements, you will also need to pass a skills test. The Passenger and School Bus endorsements almost always require a skills test, which means driving a vehicle of that type while an examiner watches and scores your performance. Skills tests take 30 minutes to an hour and must be scheduled in advance.
For Hazmat, you will also need to pass a background check. This check is performed by the Transportation Security Administration (TSA) and takes one to two weeks. You cannot legally carry hazardous materials until the TSA clears you.
Medical certification and endorsement restrictions
Some endorsements require medical certification. If you hold a Passenger or School Bus endorsement, you must have a valid medical certificate on file with your state. The medical certificate shows that you have passed a physical exam and meet federal health standards for commercial drivers. Your medical certificate must be renewed every two years.
Certain criminal convictions, traffic violations, and medical conditions can disqualify you from holding an endorsement. For Hazmat, the TSA will deny you if you have a felony conviction for certain crimes, including terrorism-related offenses, drug trafficking, or violent crimes. For Passenger and School Bus, many states will deny you if you have a conviction for certain sex offenses or crimes against children.
If you are denied an endorsement, you have the right to request a hearing or appeal. The process and timeline vary by state and by endorsement type.
Endorsement codes and what they mean on your license
Endorsements appear on your CDL as single letters or letter combinations. Here are the federal standard codes, though your state may use slightly different formatting:
| Code | Endorsement | What It Allows |
|---|---|---|
| H | Hazmat | Transport hazardous materials |
| T | Tanker | Drive tank vehicles |
| P | Passenger | Drive buses with 16+ passengers |
| D | Doubles/Triples | Pull two or three trailers |
| L | Air Brake | Drive air brake vehicles in all states |
| S | School Bus | Drive a school bus |
When you look at your CDL, the endorsements will be listed together in a single line or box. For example, your license might show "H, T, P" which means you hold Hazmat, Tanker, and Passenger endorsements. If you do not see an endorsement code on your license, you do not hold that endorsement and cannot legally operate that type of vehicle.
Restrictions that limit or remove endorsements
A restriction is different from an endorsement — it is a limitation on what you can do with your CDL. While endorsements add permissions, restrictions remove them. For example, an Air Brake restriction means you cannot drive vehicles with air brakes, or you can only drive them in your home state.
Restrictions appear on your license as codes and are usually listed separately from endorsements. Common restrictions include "L" (no air brakes), "Z" (no full air brake system), and "E" (no manual transmission). If you have a restriction, you must follow it or you are driving illegally.
You can remove a restriction by passing the appropriate test. For example, if you have an air brake restriction and you want to remove it, you must pass the air brake written test and a skills test. Once you pass, the restriction is removed and you can drive air brake vehicles anywhere.
Why employers ask about endorsements before hiring
Many trucking companies and transportation employers will not hire you unless you already hold the endorsements they need. This is because adding an endorsement takes time — you have to schedule a DMV appointment, pass tests, and in some cases wait for background checks. If a company needs a driver to start in two weeks, they will hire someone who already has the endorsement rather than wait for you to get it.
Before you explore for a commercial driving job, ask the employer which endorsements are required. Then check your CDL to see which ones you already have. If you are missing any, you can add them before you explore, which makes you a stronger candidate and speeds up the hiring process.
Some endorsements are worth getting even if you do not have a job lined up. Hazmat and Tanker endorsements, for example, open doors to higher-paying jobs. School Bus and Passenger endorsements are in high demand in many regions. Adding these endorsements to your CDL increases your job options and earning potential.
Frequently Asked Questions
Can I drive a vehicle without the endorsement if I have a CDL?
No. Driving a vehicle that requires an endorsement without holding that endorsement is illegal. You can be cited, fined, and your license can be suspended. Your employer can also be fined if they knowingly allow you to drive without the required endorsement.
How long does it take to add an endorsement?
The written test can usually be taken the same day you explore at the DMV, and you get your results when ready. If you pass, the endorsement is added to your license on the spot. Skills tests and background checks take longer — skills tests must be scheduled in advance and take one to two weeks, and Hazmat background checks take one to two weeks.
Do endorsements expire?
Endorsements themselves do not expire, but your CDL does. When you renew your CDL, your endorsements renew with it. However, if you hold a Passenger or School Bus endorsement, your medical certificate must be renewed every two years, and if it lapses, those endorsements become invalid until you get a new medical certificate.
Can I lose an endorsement?
Yes. If you are convicted of certain crimes, fail a medical exam, or accumulate too many traffic violations, your endorsement can be suspended or revoked. The rules vary by state and endorsement type. If your endorsement is suspended, you cannot legally drive that type of vehicle until it is reinstated.
What is the difference between an endorsement and a restriction?
An endorsement gives you permission to do something — drive a bus, haul hazmat, pull doubles. A restriction prevents you from doing something — no air brakes, no manual transmission. You add endorsements by passing tests; you remove restrictions the same way.