Commercial Driver's License (General Knowledge)

Specialized & Licensing - Commercial Driver's License (General Knowledge) (part of DMV & Licensing)

Basic Concepts

CDL Classes and Endorsements

Understanding CDL Classes

Commercial driver's licenses come in three main classes: A, B, and C. Which one you need depends on the type and weight of vehicle you plan to drive.

  • Class A: For combination vehicles (like tractor-trailers) with a combined weight rating (GCWR) of 26,001 pounds or more, where the towed vehicle is over 10,000 pounds.
  • Class B: For single vehicles weighing 26,001 pounds or more, or towing a vehicle not over 10,000 pounds.
  • Class C: For vehicles not meeting A or B, but designed to transport 16 or more passengers (including the driver) or carrying hazardous materials.

Endorsements

Endorsements are special permissions to operate certain types of vehicles or haul specific cargo. Examples include:

  • T: Double/triple trailers
  • P: Passenger
  • S: School bus
  • N: Tank vehicle
  • H: Hazardous materials
  • X: Tank vehicle and hazardous materials

Why Does it Matter?

Having the right class and endorsements ensures you are legally allowed to drive the vehicle you need for your job.

Quick Reference Table

ClassExample VehiclesRequires Endorsement?
A18-wheelerMaybe
BCity busMaybe
CSmall HazMat vanYes

Examples

  • A driver hauling gasoline in a tanker must have a Class B CDL with 'N' and 'H' endorsements.

  • A school bus driver needs a Class B or C CDL with 'P' and 'S' endorsements.

In a Nutshell

CDLs come in different classes and may need endorsements for specialized driving.

Key Terms

Endorsement
A special permission added to a CDL allowing the operation of specific vehicles or carriage of certain items.
GCWR
Gross Combination Weight Rating: the total allowable weight of a vehicle and its attached trailers.