Class A and Class B Licenses in California: What You Need to Know

California issues commercial driver's licenses at different levels depending on the type of vehicle you intend to operate and the weight and cargo involved. Class A and Class B are the two highest tiers of California's CDL structure, and understanding how they differ — and what it takes to obtain each — matters whether you're entering the trucking industry, operating transit vehicles, or managing heavy equipment commercially.

How California Structures Commercial Driver's Licenses

California's DMV follows the federal CDL framework established by the Federal Motor Carrier Safety Administration (FMCSA), which means the basic class definitions are consistent with other states — but California applies its own testing procedures, fees, and administrative requirements on top of the federal baseline.

California issues three classes of CDLs:

A Class A license authorizes the broadest range of vehicles. Holders can operate tractor-trailers, flatbeds, tanker combinations, livestock carriers, and other large combination rigs. With the appropriate endorsements, Class A holders can also operate vehicles that fall under Class B and Class C.

A Class B license covers single heavy vehicles — including straight trucks, large buses, dump trucks, and delivery vehicles over the weight threshold — but does not authorize driving combination vehicles where the trailer exceeds 10,000 lbs GVWR.

What California Requires to Obtain a Class A or Class B CDL

The requirements for both classes share a common foundation but diverge in testing and vehicle-specific components. 🚛

Age Requirements

California requires CDL applicants to be at least 18 years old for intrastate (within California) commercial driving. For interstate commerce — crossing state lines or operating under federal hours-of-service rules — drivers must be at least 21 years old. This age distinction applies to both Class A and Class B.

Knowledge Tests

Before receiving a Commercial Learner's Permit (CLP), applicants must pass written knowledge tests at a California DMV office. The tests required depend on the class and endorsements sought:

• General Knowledge — required for all CDL classes
• Combination Vehicles — required for Class A applicants
• Air Brakes — required if the vehicle uses air brakes (common in both Class A and B)
• Endorsement-specific tests — for passengers (P), school buses (S), hazardous materials (H), doubles/triples (T), or tankers (N)

Class B applicants don't need the Combination Vehicles test unless they're pursuing Class A, but they may still need Air Brakes and relevant endorsement tests depending on what they plan to operate.

The Commercial Learner's Permit

After passing required knowledge tests, applicants receive a CLP, which must be held for a minimum of 14 days before the skills test can be scheduled. This federal requirement applies in California as it does in every other state.

Skills Test

The CDL skills test has three components:

1. Pre-trip vehicle inspection — demonstrating knowledge of safety checks
2. Basic vehicle controls — backing, turning, and maneuvering
3. On-road driving — operating in real traffic conditions

The skills test must be taken in a vehicle representative of the class and endorsements being sought. If you're testing for a Class A license, you must test in a combination vehicle. A Class B applicant tests in a straight heavy vehicle.

Medical Requirements

Both Class A and Class B CDL holders must meet FMCSA medical standards and carry a valid Medical Examiner's Certificate. In California, medical certification status is tied directly to your CDL record. Drivers with certain medical conditions may be subject to more frequent examinations or may qualify only for intrastate driving with a state-issued medical waiver.

Endorsements That Apply to Class A and Class B 📋

Neither class is a standalone authorization for every type of commercial operation. Endorsements are added to a CDL to cover specific vehicle types or cargo:

Each endorsement requires passing an additional written test, and some (like Passenger and School Bus) require additional skills testing and background checks.

Key Differences Between Class A and Class B

The practical distinction comes down to what you're hauling and how it's connected. Class A covers the full tractor-trailer combination; Class B covers large single-unit vehicles. A driver with a Class A can operate Class B vehicles (with proper endorsements), but a Class B holder cannot legally operate Class A combination vehicles.

This matters for career purposes. Long-haul trucking and most freight careers require Class A. Transit bus operators, concrete mixer drivers, and straight-truck delivery roles typically require Class B.

Factors That Shape Your Specific Path

No two CDL applications follow the exact same path. What applies to your situation depends on:

• Your driving history — prior violations, DUIs, or out-of-state records can affect eligibility
• Prior CDL status — California has specific rules for transferring an out-of-state CDL, including which tests may be waived
• Endorsements you need — the Hazmat endorsement requires a TSA background check through the federal HTAP program, adding a separate step
• Whether you're applying for intrastate or interstate driving — affects age eligibility and which medical standards apply
• Any restriction codes — such as No Air Brakes (L) or No Full Air Brakes, which are added when a driver tests in a vehicle without air brakes

California's CDL fee schedule, testing appointment availability, and processing timelines are set by the California DMV and can change. The specific combination of tests, medical documentation, and endorsements you'll need — and what the process looks like for your vehicle type and employment situation — depends on details that go beyond class definitions alone.