CDL Class Comparison: A vs. B vs. C
| CDL Class | Vehicle Type | GVWR | Typical Jobs | Avg Pay Range |
|---|---|---|---|---|
| Class A | Tractor-trailer (semi), doubles, triples | 26,001+ lbs combination | OTR, regional, flatbed, tanker | $65k – $95k/yr |
| Class B | Straight truck, bus, dump truck | 26,001+ lbs single vehicle | Local delivery, transit, construction | $45k – $68k/yr |
| Class C | Smaller vehicle carrying 16+ passengers or hazmat | Under 26,001 lbs | Shuttle, small hazmat delivery | $38k – $55k/yr |
| Class A licenses are the most versatile — a Class A holder can legally operate Class B and C vehicles. Class B holders cannot legally operate Class A vehicles. | ||||
Federal Requirements (All States)
Under FMCSA regulations (49 CFR Part 383), all CDL applicants must: be at least 18 years old for intrastate (within one state) and 21 for interstate (crossing state lines) driving, hold a valid regular driver's license, provide a Social Security Number, pass a DOT physical examination performed by a FMCSA-certified medical examiner, pass CDL knowledge (written) tests, pass CDL skills tests (pre-trip inspection, basic vehicle control, road test), provide proof of citizenship or legal US presence, and be registered in the FMCSA Drug & Alcohol Clearinghouse. Since February 2022, all new CDL applicants must also complete an FMCSA-approved Entry-Level Driver Training (ELDT) program before taking the CDL skills test.
The DOT Physical Examination
The DOT medical exam must be performed by a licensed medical examiner listed on the FMCSA National Registry. The exam covers vision (at least 20/40 in each eye with or without correction), hearing (ability to perceive forced whisper in better ear), blood pressure (must be below 160/100 for a 1-year certificate, or controlled with medication), diabetes (insulin-treated diabetics require special exemption — apply through FMCSA), epilepsy and seizure history (10-year seizure-free period required without exemption), and cardiovascular health. The exam costs $75–$150 at most clinics. A 2-year medical certificate is standard for healthy drivers. Some conditions result in 1-year or shorter certificates.
CDL Knowledge Tests
All CDL applicants must pass the General Knowledge test. Additional tests required based on license class and endorsements: Combination Vehicles (required for Class A), Air Brakes (if vehicle has air brakes), Passenger Transport (P endorsement), School Bus (S endorsement), Tank Vehicles (N endorsement), Hazardous Materials (H endorsement — plus TSA clearance), and Doubles/Triples (T endorsement). Tests are administered at your state DMV/MVA. Most states allow 3 attempts before a mandatory waiting period. Study materials: FMCSA provides free CDL manuals at fmcsa.dot.gov. Each state also publishes its own CDL manual — use both.
Timeline from Start to First Paycheck
| Step | Duration | Notes |
|---|---|---|
| DOT physical | 1–3 days | Schedule in advance — popular examiners book up |
| Study & pass knowledge tests | 1–4 weeks | Self-study or prep course |
| CLP issuance | 1 day | Issued same day as knowledge test passage |
| CLP holding period | 14 days min | Federal minimum before skills test |
| ELDT program | 3–6 weeks | Required since Feb 2022 for new CDL holders |
| Skills test | 1 day | Schedule at state DMV or approved 3rd party |
| CDL issuance | 1–5 days | Mail or in-person depending on state |
| Carrier application & offer | 1–3 weeks | Faster with multi-carrier platforms |
| Orientation & first load | 1–2 weeks | Paid orientation at most major carriers |
| Total time from zero to first paycheck: approximately 8–16 weeks for most new drivers. | ||
Key Takeaways
- Class A CDL is the most valuable — allows operation of all vehicle classes
- ELDT (Entry-Level Driver Training) is mandatory for all new CDL applicants since Feb 2022
- DOT physical must be performed by FMCSA-registered medical examiner
- CLP must be held minimum 14 days before skills test — plan accordingly
- Total timeline: 8–16 weeks from start to first paycheck