The letters and numbers on your license are codes for what you're allowed to drive and any restrictions you have

Your driver's license contains several letter codes that tell police officers, employers, and insurance companies what vehicles you can legally operate and what conditions explore to your driving. The main codes appear in a section labeled "Class" or "Endorsements" and "Restrictions." Understanding these codes matters because driving a vehicle outside your license class or ignoring a restriction can result in a ticket, even if you're a safe driver.

The codes vary slightly by state, but the most common ones follow a national standard. Your state's DMV website lists the exact codes used in your state, and you can also find them printed on the back of your physical license or in your state's driver's manual.

Key Takeaways

  • License classes (A, B, C, and so on) determine what size and type of vehicle you can drive legally.
  • Endorsements are additional permissions you've earned, such as the right to drive a motorcycle or tow a trailer.
  • Restrictions are limitations on your driving, such as corrective lenses, automatic transmission only, or no interstate driving.
  • Each state uses slightly different letter codes, so check your state's DMV handbook to decode your specific license.
  • Driving outside your license class or ignoring a restriction is a moving violation, even if you pass a skills test later.

What the license class letters mean

The license class is the primary category that determines what you can drive. Most states use letters A through D, though some use numbers or combinations. Class C is the standard passenger car license that most people hold. It allows you to drive a regular car, pickup truck, or van up to a certain weight limit—usually 26,000 pounds or less.

Class B typically covers larger vehicles like single-unit trucks or buses that weigh more than the Class C limit but are not combination vehicles (a truck pulling a trailer). Class A is a commercial license for tractor-trailers and other combination vehicles. Class M or "motorcycle" is a separate endorsement in most states, not a class by itself, though a few states do list it as a class. If your license shows only Class C with no other letters, you can drive a standard passenger vehicle and nothing else.

Some states add numbers or letters after the class letter to show additional detail. For example, "C1" might mean you can drive a van but not a bus, while "B1" might restrict you to certain types of trucks. Check your state's DMV handbook for the exact breakdown, because these secondary codes are not uniform across the country.

Endorsements: permissions you've earned

Endorsements are marked with letters and show that you've passed additional testing to operate specific vehicle types or perform specific tasks. The most common endorsement is M for motorcycle, which means you've passed a motorcycle skills test and can legally ride a motorcycle. Some states call this "H" instead of "M."

T for towing means you've demonstrated knowledge of trailer safety and can tow a trailer behind your vehicle. P for passenger means you can drive a vehicle carrying passengers for hire (like a taxi or rideshare). S for school bus means you've passed the background check and training required to drive a school bus. N for tank vehicle means you can transport liquids or gases in a tanker truck.

If your license shows no endorsement letters, you have only the basic permissions for your license class. You cannot legally operate a motorcycle, tow a trailer, or drive a school bus, even if you think you know how. You would need to pass the written test and skills test for that endorsement first.

Restrictions: limitations on your driving

Restrictions appear as single letters and tell you what you cannot do or what conditions must be met while you drive. A for corrective lenses is one of the most common—it means you must wear glasses or contacts every time you drive. Driving without them is a violation, even if you can see reasonably well without them.

B for automatic transmission only means you took your driving test in an automatic car and have not demonstrated the ability to operate a manual transmission. You can only legally drive automatic vehicles. D for daylight driving only means you cannot drive between sunset and sunrise. E for no interstate driving means you cannot drive on interstate highways. F for outside mirror means your vehicle must have an outside mirror on both sides.

I for ignition interlock device means your vehicle must have an ignition interlock installed—a device that requires you to pass a breath test before the car will start. This restriction is typically ordered after a DUI conviction. K for no air brakes means you cannot drive a vehicle with air brakes, usually because you did not pass the air brake test required for certain commercial licenses.

If your license shows no restriction letters, you have no special limitations beyond the basic rules of the road. You can drive at any time of day, on any road type, in any transmission type, as long as you stay within your license class.

How to find your state's specific codes

Because each state's DMV sets its own codes, the letters on your license may not match exactly what another state uses. Your state's driver's manual, available free from your DMV website, contains a full chart of every code used in your state and what it means. You can also call your local DMV office and ask them to explain any letter on your license.

If you received a new license recently and notice a code you don't recognize, do not ignore it. That code is legally binding and affects what you can and cannot do behind the wheel. A few minutes with your state's manual will clear up any confusion and help you stay on the right side of the law.

What happens if you drive outside your license class or ignore a restriction

Driving a vehicle type you're not licensed for—such as operating a motorcycle without an M endorsement, or driving at night with a daylight-only restriction—is a moving violation. You can be ticketed even if you're an excellent driver and even if you could pass the test for that vehicle type. The violation goes on your driving record and can increase your insurance rates.

In some cases, driving outside your license class can result in criminal charges, particularly if you cause an accident. For example, driving a commercial truck without a commercial license, or driving a school bus without the S endorsement, may be treated more seriously than a standard moving violation. Your vehicle can also be impounded in some states if you're caught driving a class you're not licensed for.

How to add an endorsement or remove a restriction

If you want to add an endorsement—such as getting your motorcycle endorsement or your towing endorsement—you must pass the written test for that endorsement and, in most cases, a skills test. You can schedule these tests at your local DMV. The process typically takes a few weeks from start to finish, depending on how quickly you can schedule the tests.

If you want to remove a restriction, such as a corrective lenses restriction after eye surgery, you must visit your DMV in person with proof that the restriction no longer applies. For example, if you had a corrective lenses restriction and now have 20/20 vision, bring a letter from an eye doctor stating your current vision. The DMV will issue you a new license without that restriction.

Frequently Asked Questions

Can I drive a motorcycle if my license doesn't have an M endorsement?

No. Driving a motorcycle without an M (or H, depending on your state) endorsement is a moving violation. You must pass the written test and skills test for the motorcycle endorsement before you can legally ride. Some states allow you to take the skills test on your own motorcycle if you own one, or you can use a motorcycle provided by the DMV testing site.

What does it mean if my license says "corrective lenses"?

It means you must wear glasses or contacts every time you drive. This restriction is placed on your license if you failed the vision test without correction or if your vision is only acceptable with correction. Driving without your corrective lenses is a violation, even if you feel you can see well enough.

Can I tow a trailer if my license doesn't have a T endorsement?

Most states allow you to tow a small trailer (under a certain weight limit, usually 3,000 pounds) without a T endorsement. However, if your license specifically shows a restriction against towing, or if you want to tow a larger trailer, you need the T endorsement. Check your state's DMV handbook for the exact weight threshold.

What happens if I get pulled over and my license has a restriction I didn't know about?

The officer will likely issue you a ticket for violating the restriction. You can contest the ticket in traffic court if you believe the restriction was placed in error, but the burden is on you to know what your license says. Review your license carefully when you receive it and ask the DMV to explain any code you don't understand.

Do I need to renew my endorsements when I renew my license?

In most states, endorsements and restrictions carry over to your new license automatically when you renew. However, some endorsements—such as the P endorsement for passenger vehicles—may require you to pass a new background check or test at renewal time. Check with your state's DMV when you renew to confirm whether any of your endorsements need to be revalidated.