What restrictions come with a CDL

A commercial driver's license (CDL) comes with specific rules about what you can and cannot do, even after you pass the test and get the license in your wallet. The restrictions depend on which endorsements you hold, what class of vehicle you're driving, and sometimes the state where you're licensed. Understanding these limits matters because violating them can result in fines, license suspension, or criminal charges — even if you're a safe driver.

The main restrictions fall into three categories: what vehicles you can operate, what cargo you can carry, and what activities are off-limits regardless of your vehicle or load. Some restrictions are automatic based on your license class or endorsement. Others are added by a judge or the state if you've violated traffic laws or failed a medical exam.

Key Takeaways

  • CDL restrictions vary by license class (A, B, or C) and which endorsements you hold, so you must know which restrictions explore to your specific license.
  • Common restrictions include prohibitions on certain cargo types, passenger transport, or operating specific vehicle configurations without additional endorsements.
  • Medical conditions, traffic violations, or failed tests can result in added restrictions that limit when or where you can drive.
  • Driving outside your restrictions is a violation that can lead to fines, points on your record, and license suspension or revocation.
  • Your CDL card lists your restrictions as codes; your state's DMV handbook explains what each code means.

Restrictions based on your license class

Your CDL class determines the heaviest vehicle you can legally operate. Class A allows you to drive any combination of vehicles with a gross vehicle weight rating (GVWR) of 26,001 pounds or more. Class B limits you to a single vehicle with a GVWR of 26,001 pounds or more, or any tractor-trailer combination where the trailer weighs less than 10,001 pounds. Class C is for vehicles under 26,001 pounds that carry hazardous materials or 16 or more passengers.

If you hold a Class B license, you cannot legally operate a Class A vehicle — even if you're an experienced driver. Doing so is a violation. The same applies in reverse: a Class A license does not automatically let you drive every Class B vehicle if you lack the proper endorsement for that vehicle type. For example, you may need a passenger (P) endorsement to drive a bus, even with a Class A license.

Restrictions tied to endorsements you don't have

Endorsements unlock the right to carry specific cargo or passengers. Without the endorsement, you're restricted from that work. A hazardous materials (H) endorsement is required to transport placarded hazardous cargo. A passenger (P) endorsement is required to operate a bus or any vehicle designed to carry 16 or more people. A tanker (N) endorsement is required to drive a tanker vehicle, even if you have an H endorsement.

The restriction is absolute: you cannot legally transport that cargo or those passengers without the endorsement, regardless of your experience or the distance. If you're caught driving a tanker without an N endorsement, you face a violation. Many drivers hold multiple endorsements to expand what they can legally do, but each one requires passing a separate knowledge test and, in some cases, a skills test.

Medical and vision restrictions

If you fail the medical exam required for a CDL, or if a doctor certifies that you have a condition affecting your ability to drive safely, your state may add restrictions to your license. Common medical restrictions include driving only during daylight hours, wearing corrective lenses, or limiting your driving to a certain radius from your home or a specific route.

Vision restrictions are frequent. If your vision does not meet the federal standard of 20/40 in each eye (corrected or uncorrected), you may receive a restriction requiring you to wear glasses or contacts while driving. Some states add a restriction if you have only one eye or limited peripheral vision. These restrictions appear as codes on your CDL card and are legally binding — driving outside them is a violation.

Restrictions from traffic violations or failed tests

If you're convicted of certain traffic violations, your state may add restrictions to your CDL as a penalty. A conviction for driving under the influence (DUI), reckless driving, or causing an accident while violating traffic laws can result in restrictions limiting where, when, or under what conditions you can drive. Some states impose a restriction requiring an ignition interlock device if you've been convicted of DUI.

Failed skills tests or failed medical recertifications can also trigger restrictions. If you fail a road test, some states will restrict you from operating certain vehicle types until you pass a retest. If you fail a medical exam, you may be restricted to local driving only, or to driving during daylight hours, until you pass a new exam or provide medical documentation that you're fit to drive without limits.

Restrictions on passenger and cargo transport

Even with the right endorsement, some CDL holders face restrictions on what they can transport. A passenger (P) endorsement allows you to drive a bus, but you may be restricted from transporting passengers under certain conditions — for example, if you have a medical condition that could impair your judgment or reaction time. A hazardous materials (H) endorsement allows you to transport placarded hazmat, but you cannot transport certain classes of hazmat if you lack a tanker (N) endorsement or if your license carries a specific hazmat restriction.

Some states restrict CDL holders from transporting certain cargo types based on criminal history or prior violations. For example, a driver with a prior conviction for transporting illegal drugs may be permanently restricted from transporting sealed cargo or operating in certain jurisdictions. These restrictions are documented on your license and enforced by law enforcement and your employer.

How to find out what restrictions explore to you

Your CDL card lists all restrictions as two-digit codes printed in the "Restrictions" section. Common codes include "B" (corrective lenses required), "D" (daylight driving only), "E" (automatic transmission only), and "L" (left mirror required). Your state's CDL handbook or DMV website provides a full list of restriction codes and their meanings.

If you're unsure what your restrictions mean, contact your state's DMV or commercial driver's license section. You can also ask your employer or a CDL training school to explain them. Knowing your restrictions is your responsibility — claiming you didn't understand a restriction is not a legal defense if you violate it. If you believe a restriction was added in error, you can request a hearing with your state's DMV to challenge it.

Frequently Asked Questions

Can I drive a vehicle outside my license class if someone else is paying me?

No. Your license class and restrictions explore regardless of who pays you or what the job is. Driving a Class A vehicle with a Class B license is a violation whether you're paid or volunteering. The only exception is driving a personal vehicle for personal use, which does not require a CDL at all.

What happens if I drive with a restriction I didn't know about?

Ignorance of a restriction is not a legal defense. If you're stopped and found to be driving outside your restrictions, you can be cited for a violation. The penalty varies by state and the type of restriction, but can include fines, points on your record, and suspension or revocation of your CDL.

Can restrictions be removed or changed?

Some restrictions can be removed by passing a retest or providing updated medical documentation. Medical restrictions tied to vision or hearing can sometimes be lifted if you pass a new exam. Restrictions added as penalties for violations typically cannot be removed until the penalty period ends or you complete a required program. Contact your state's DMV to learn whether a specific restriction can be changed.

Do I need a separate endorsement to drive a school bus?

Yes. You need a passenger (P) endorsement to drive any bus, including a school bus. Some states also require an additional school bus (S) endorsement. You must pass the knowledge test for each endorsement. Many school districts also require a background check and fingerprinting before hiring.

What if my employer asks me to drive outside my restrictions?

You should refuse. Driving outside your restrictions is illegal, and you are liable for any violation or accident that results. Your employer cannot override your license restrictions. If your employer pressures you to violate your restrictions, you can report the issue to your state's Department of Transportation or labor board.