CDLCareerLicense Class

CDL Classes A, B, C Explained — Which Do You Need?

Q: Can I upgrade from a Class B to a Class A later?

Yes. You'll need to retake the skills test (pre-trip, basic control, road test) in a Class A vehicle — but the General Knowledge knowledge already counts. Many drivers start Class B (local routes, dump trucks) and upgrade after a year for over-the-road work.

Q: Do I need a CDL to drive a rental moving truck?

Almost never. Rental moving trucks (U-Haul, Penske) are designed under the 26,001 lb GVWR limit specifically so renters don't need a CDL. Anything heavier — like a contractor's dump truck or any combination over 26,001 lbs — requires the matching CDL class.

Q: How much does a CDL cost to get?

The license itself is typically $50–$100. Add the knowledge tests ($10–$50 per attempt), the skills test ($50–$150), CDL school if you use one ($3,000–$8,000), and a DOT physical ($75–$150). Total: $4,000–$10,000 if going through school, or under $500 if you train yourself (rare but legal).

Q: Is the same exam used in every state?

All states test the same FMCSA-mandated knowledge areas, but the exact question wording is set by the state. Pass rates and test fees vary too. Always check your state DMV for the local format before you sit.

What's the difference between a Class A, Class B and Class C CDL? Weight limits, what each class lets you drive, required endorsements, and which class fits your career goal.

April 22, 2026 · Commercial Driver Prep team

If you’re new to commercial driving, the A / B / C thing is the first source of confusion. Here’s exactly what each class means, and which one matches the work you actually want.

Quick comparison

Class	What you drive	Combined GVWR	Trailer GVWR	Typical jobs
Class A	Tractor-trailers, doubles, triples	26,001+ lbs	>10,000 lbs	Long-haul, tankers, flatbeds, freight
Class B	Straight trucks, large buses, dump trucks	26,001+ lbs	≤10,000 lbs	Local delivery, garbage, transit buses, school buses
Class C	Smaller HazMat, 16+ passenger vehicles	<26,001 lbs	<10,000 lbs	Small shuttles, small HazMat tankers

The simple rule: Class A = anything with a heavy trailer. Class B = anything heavy without a trailer (or with a light trailer). Class C = smaller commercial vehicles that still need an endorsement (HazMat or passenger).

Class A — the most flexible licence

A Class A CDL lets you drive anything in Class B or C as well. That’s why most career truckers go straight for Class A even if their first job is local — it keeps every door open.

You need a Class A for:

Conventional tractor-trailer (Peterbilt, Kenworth, Volvo pulling a 53’ trailer)
Doubles and triples (with the T endorsement)
Most over-the-road work
Tankers over 10,000 lbs (with the N endorsement)
Most flatbed and reefer freight

Common endorsements paired with Class A:

T — Doubles/Triples
H — HazMat (study guide)
N — Tank Vehicle
X — Combination of N + H
Air Brakes (no L restriction) — required for almost any tractor

Did you know? A Class A driver who passes a Class A road test in an air-brake-equipped vehicle automatically qualifies for the Air Brakes endorsement. Take your road test in an automatic-transmission truck though, and you’ll get an E restriction barring you from manual transmissions.

Class B — local work, no trailer

Class B is straight-truck only — single-unit vehicles with a GVWR of 26,001+ lbs. The cab and cargo area are part of one rigid truck.

You need a Class B for:

Dump trucks
Garbage / refuse trucks
Large box trucks (over 26,001 lbs)
Transit and school buses (with the P or S endorsement)
Cement mixers
Roll-off container trucks

Common endorsements paired with Class B:

P — Passenger (16+ seats)
S — School Bus
Air Brakes — required for almost all Class B trucks (Air Brakes practice →)
H — HazMat (for HazMat box trucks)

Tip: A school bus driver typically needs Class B + P + S + Air Brakes — four separate tests. Plan an extra week of study just for the P and S sections.

Class C — niche but real

A Class C CDL is for vehicles that don’t meet Class A or B weight requirements but still need a CDL because of what they carry:

16+ passengers (including the driver) — small shuttle vans, hotel airport shuttles
HazMat in placarded quantities (any amount that requires placards under 49 CFR 172)

If you’re driving an airport hotel shuttle, this is probably you.

How long does each class take to earn?

Class	Total time (full-time school)	Self-paced
Class A	4–8 weeks	2–4 months
Class B	3–6 weeks	1–3 months
Class C	1–3 weeks	2–6 weeks

What about endorsements vs. restrictions?

Endorsements add permissions (H = you can carry HazMat).
Restrictions remove permissions (E = no manual transmission; L = no air brakes; M = no Class A passenger).

The exam structure:

Item	Knowledge test?	Skills test?	TSA check?
General Knowledge	✓	—	—
Air Brakes	✓	✓ (in test vehicle)	—
Doubles/Triples (T)	✓	—	—
Tank Vehicle (N)	✓	—	—
HazMat (H)	✓	—	✓
Passenger (P)	✓	✓	—
School Bus (S)	✓	✓	(some states)

So which class do you need?

Career goal	Get this
Over-the-road trucking	Class A + Air Brakes + T (eventually H)
Owner-operator	Class A + Air Brakes + H + N + X
Local delivery / dump truck	Class B + Air Brakes
School bus	Class B + Air Brakes + P + S
Transit bus	Class B + Air Brakes + P
Tanker work	Class A + Air Brakes + N (+ H if HazMat tankers)
HazMat truck (small)	Class C + H
Airport shuttle	Class C + P

Get started

All three of our apps work together for the most common CDL path:

CDL Test for General Knowledge + every endorsement section
Air Brakes Test for the air brake section specifically
HazMat Test for the H endorsement

Compare them → or try a free quiz →

Frequently asked questions

Can I upgrade from a Class B to a Class A later?

Yes. You'll need to retake the skills test (pre-trip, basic control, road test) in a Class A vehicle — but the General Knowledge knowledge already counts. Many drivers start Class B (local routes, dump trucks) and upgrade after a year for over-the-road work.

Do I need a CDL to drive a rental moving truck?

Almost never. Rental moving trucks (U-Haul, Penske) are designed under the 26,001 lb GVWR limit specifically so renters don't need a CDL. Anything heavier — like a contractor's dump truck or any combination over 26,001 lbs — requires the matching CDL class.

How much does a CDL cost to get?

The license itself is typically $50–$100. Add the knowledge tests ($10–$50 per attempt), the skills test ($50–$150), CDL school if you use one ($3,000–$8,000), and a DOT physical ($75–$150). Total: $4,000–$10,000 if going through school, or under $500 if you train yourself (rare but legal).

Is the same exam used in every state?

All states test the same FMCSA-mandated knowledge areas, but the exact question wording is set by the state. Pass rates and test fees vary too. Always check your state DMV for the local format before you sit.