CDL Classes, Endorsements, and Route Types

30 min read Training Guide

The differences between CDL Class A, B, and C, the endorsements worth chasing, and the tradeoffs of OTR, regional, and local routes.

Table of contents

What the work looks like

FMCSA defines three CDL classes by GVWR:

  • Class A: combination vehicles with a GCWR over 26,001 pounds where the trailer is over 10,000 pounds. Covers most tractor-trailers. Highest demand, widest range of jobs.
  • Class B: single vehicles over 26,001 pounds (dump trucks, straight box trucks, buses). Commonly local.
  • Class C: smaller vehicles that carry hazmat placards or 16+ passengers. Less common as a first career move.

Endorsements add scope:

  • H (Hazmat): requires a TSA background check. Adds pay on any route.
  • N (Tanker): for liquid bulk transport.
  • X (Hazmat + Tanker): combined, common in fuel and chemical hauling.
  • P (Passenger): for buses and motorcoaches.
  • S (School bus): P plus school-bus-specific test.
  • T (Doubles/Triples): for pulling multi-trailer rigs, required in LTL and some specialty hauling.

Route types:

  • OTR (over the road): away 2 to 4 weeks at a time, sleep in the cab, highest pay per mile but lowest home time.
  • Regional: runs within a few states, home every weekend or on a 5-and-2 or 7-and-3 schedule.
  • Dedicated: recurring route for a specific customer, predictable pay and hours.
  • Local: home every night, lower miles but steady hours, often better hourly pay on LTL, foodservice, or concrete.
  • Team: two drivers rotate sleep, highest mileage and pay but you are stuck in a truck with someone you may not know well.

Safety and tools

Hours of service (HOS) rules are the framework every driver works under. ELDs (electronic logging devices) record duty status automatically. Violations show up on your PSP (Pre-Employment Screening Program) record and follow you between carriers.

Pre-trip inspection is the DOT-required walk-around at the start of every shift. Drivers cover brakes, tires, lights, coupling, fluids, and safety equipment. The vehicle pre-trip inspection is a graded portion of the CDL skills test.

Hazmat loads require placarding, segregation, a shipping paper within reach, and driver awareness of emergency procedures (the Emergency Response Guidebook, ERG).

Your first exercise

Take a free online CDL practice test for Class A General Knowledge and Air Brakes. Note which sections you struggle with. Also research what a TWIC card (Transportation Worker Identification Credential) costs and how long it takes to get, since many port and hazmat jobs require one.

Where to go next

Core skills: Commercial Driving (CDL), Vehicle Pre-Trip Inspection, Defensive Driving, Route Planning & Navigation, Load Securing & Cargo Safety. Add-ons: Hazardous Materials Handling for hazmat, Confined Space Entry for tanker loading, and Workplace Safety for any warehouse or yard work tied to the route.