Types of Commercial Driver's Licenses in Chicago

Key Takeaways

• There are three federal CDL classes. Class A covers heavy combination vehicles like semi-trucks and tractor-trailers, Class B covers large single vehicles like dump trucks and city buses, and Class C covers vehicles built for 16 or more passengers or placarded hazmat loads.
• Endorsements authorize specific vehicles and cargo. On top of the right class, drivers may need endorsements such as H (hazardous materials), N (tank vehicles), P (passengers), S (school bus), T (double/triple trailers), or X (combined tank and hazmat), each requiring extra testing.
• Illinois and federal rules both apply. The Illinois Secretary of State sets baseline CDL requirements like age, testing, and medical certification, while FMCSA regulations govern hours of service, drug and alcohol testing, logging, and inspections, and violations of either can support a negligence claim.
• A driver's CDL status can be decisive in a crash claim. Operating without the proper class, missing a required endorsement, or driving on a suspended CDL is direct evidence of negligence, which is why Conboy Law pulls CDL and FMCSA records when investigating Chicago truck accidents.

Commercial trucks, buses, and heavy vehicles share Chicago's roads with millions of passenger cars every day. When a driver does not have the right license for the vehicle they are operating, the risk of a catastrophic accident increases significantly. 

Conboy Law represents people injured in Chicago truck and commercial vehicle accidents, and we know how CDL requirements connect directly to liability. Call (312) 376-4291 for a free case evaluation today.

What Are the 3 Types of CDL Licenses?

Federal law recognizes three primary CDL classes: Class A, Class B, and Class C. Illinois also issues several non-commercial license classifications. The classes are based on the type of vehicle being operated, its weight, and in some cases, the passengers or cargo being transported. 

Here is a quick breakdown of the CDL classes and types of CDL licenses before the full details:

• Class A - Combination vehicles with a gross combination weight rating of 26,001 pounds or more, where the towed vehicle weighs more than 10,000 pounds
• Class B - Single vehicles with a gross vehicle weight rating of 26,001 pounds or more, towing no more than 10,000 pounds
• Class C - Vehicles designed to transport 16 or more passengers, including the driver, or vehicles transporting hazardous materials requiring placards, when the vehicle does not otherwise qualify as a Class A or Class B vehicle.

Class A CDL

A Class A CDL is the most comprehensive commercial license. It covers any combination of vehicles where the total gross combination weight rating is 26,001 pounds or more, provided the vehicle being towed weighs more than 10,000 pounds.

Vehicles that require a Class A CDL include tractor-trailers, semi-trucks, flatbed trucks hauling heavy loads, livestock haulers, and tanker trucks. A Class A CDL holder can generally also operate Class B and Class C vehicles, making it the most flexible commercial license available.

Class A drivers are subject to the strictest testing requirements, including a general knowledge test, a combination vehicle knowledge test, and an air brake test if the vehicle is equipped with air brakes. Depending on the cargo, additional endorsements are also required.

Class B CDL

A Class B CDL covers single vehicles with a gross vehicle weight rating of 26,001 pounds or more. The vehicle being towed must not exceed 10,000 pounds.

Common Class B vehicles in Chicago include city buses, dump trucks, box trucks, garbage trucks, cement mixers, and large delivery trucks. Bus drivers transporting passengers must also carry a passenger endorsement in addition to the Class B license.

Class B CDL holders can generally operate Class C vehicles but cannot operate combination vehicles that require a Class A license. The testing for a Class B CDL includes a general knowledge test and, if applicable, an air brake test and endorsement tests.

Class C CDL

A Class C CDL is required for drivers operating vehicles designed to transport 16 or more passengers, including the driver, or vehicles used to transport hazardous materials that require placards under federal law, provided the vehicle does not otherwise qualify as a Class A or Class B vehicle.

Class C vehicles commonly include small passenger buses, paratransit vans, airport shuttle vehicles, and certain hazmat vehicles. Because Class C licensing is based primarily on passenger capacity or cargo type rather than vehicle weight, it is often the most misunderstood CDL classification.

Drivers seeking a Class C CDL must pass the general knowledge test and any required endorsement tests, such as passenger or hazardous materials endorsements.

Class A vs. Class B vs. Class C CDL

Understanding the differences between CDL classes can help drivers determine which license they need and can also play an important role in truck accident cases involving improper licensing.

CDL Endorsements: What They Are and Why They Matter

In addition to holding the correct CDL class, commercial drivers may be required to obtain endorsements that authorize them to operate specific types of vehicles or haul certain types of cargo. 

Here is a complete CDL endorsements list recognized by Illinois and the FMCSA. Endorsements appear as letter codes on the driver's CDL and are issued by the Illinois Secretary of State after additional testing.

H: Hazardous Materials

The H endorsement authorizes a driver to transport hazardous materials that require placards under federal law. Applicants must pass a written knowledge test and clear a TSA security threat assessment before this endorsement is issued. Failure to carry a required H endorsement while transporting hazmat is a serious violation.

N: Tank Vehicles

The N endorsement is required to operate tank vehicles used to haul liquids or liquefied gases. This includes agricultural tankers, fuel tankers, and industrial liquid transport vehicles. Tank vehicles present unique handling challenges, especially due to liquid surge when braking.

P: Passenger Vehicles

The P endorsement is required for any commercial driver transporting passengers in a vehicle that requires a Class A, B, or C CDL. This covers bus drivers, charter vehicle operators, and transportation network vehicles above the passenger threshold.

S: School Bus

The S endorsement is required specifically for drivers who operate school buses transporting students in kindergarten through twelfth grade. In addition to the knowledge and skills tests, school bus drivers must pass a background check before this endorsement is issued.

T: Double and Triple Trailers

The T endorsement authorizes a Class A CDL holder to pull two or three trailers. Note that triple trailers are not permitted on Illinois highways, so the practical use of the T endorsement in Illinois is limited to double trailers.

X: Combination Tank and Hazmat

The X endorsement is a combination endorsement that authorizes the driver to operate both tank vehicles and transport hazardous materials. It requires the same TSA security threat assessment as the H endorsement, in addition to the tank vehicle knowledge test.

What Are the Basic Requirements to Get a CDL in Illinois?

The Illinois Secretary of State issues all commercial driver's licenses in Illinois. Understanding the CDL license types available is the first step for any driver seeking to operate a commercial vehicle. 

To qualify for a CDL, an applicant must meet the following requirements:

1. Be at least 18 years old to drive a commercial vehicle within Illinois, and at least 21 years old for interstate driving or to transport hazardous materials or passengers
2. Hold a valid Illinois driver's license before applying for a Commercial Learner's Permit (CLP).
3. Provide proof of legal presence in the United States
4. Self-certify interstate or intrastate medical driving status and provide a medical certificate for interstate drivers
5. Pass all required written knowledge tests, including the general knowledge test, combination knowledge test for Class A, air brake test if applicable, and any endorsement knowledge tests
6. Pass the CDL skills and road test at a certified testing facility

Illinois CDLs must be renewed every four years. Drivers who change their name or address must notify the Secretary of State within 30 days.

How Do FMCSA Federal Regulations Affect Illinois CDL Drivers?

Illinois CDL requirements set the baseline for commercial driving, but drivers must also comply with federal regulations issued by the Federal Motor Carrier Safety Administration, known as the FMCSA.

FMCSA regulations govern several critical areas of commercial driving. These include hours of service limits to prevent driver fatigue, mandatory drug and alcohol testing, electronic logging device requirements, vehicle inspection standards, and cargo securing procedures. These federal rules apply to drivers operating in interstate commerce as well as many intrastate operations.

When a commercial driver or trucking company violates FMCSA regulations, those violations can directly support a negligence claim after an accident. A driver who exceeded their hours of service limit before a crash, or a trucking company that failed to conduct required drug tests, may be held liable for the resulting harm.

How Does a Driver's CDL Status Affect a Truck Accident Claim in Chicago?

A commercial driver's CDL class, endorsements, and compliance record are central to establishing liability after a truck accident in Chicago. Here is how each element connects to a personal injury claim.

A driver who operates a vehicle that requires a higher CDL class than they hold has no legal authority to be behind the wheel. That lack of authorization is direct evidence of negligence. A driver hauling hazardous materials without an H endorsement, or transporting passengers without a P endorsement, has violated both Illinois law and federal regulations.

A suspended or disqualified CDL is equally significant. Under FMCSA rules, a trucking company is prohibited from allowing a driver to operate a commercial vehicle if the driver's CDL is suspended, revoked, or disqualified. A company that knowingly puts a disqualified driver on the road faces liability not only for the driver's negligence but potentially for its own failure to follow federal law.

When we investigate a truck accident at Conboy Law, we obtain the driver's CDL records, verify the license class and endorsements for the vehicle being driven, and review the driver's FMCSA compliance file. Violations of CDL requirements or federal regulations often become some of the most powerful evidence in a truck accident case. 

If you need a commercial vehicle accident attorney in Chicago, call (312) 376-4291 today.

Contact Our Chicago Truck Accident Lawyer for a Free Consultation

If you were injured in a truck or commercial vehicle accident in Chicago, the driver's CDL status and compliance record may be key to your case. Conboy Law is ready to investigate, gather the evidence, and fight for the compensation you deserve. 

Call (312) 376-4291 today to speak with our team and get a free case evaluation with no obligation.