What CDL endorsements exist and what do they require under 49 CFR 383.93?

Short answer

There are six CDL endorsements: Double/Triple Trailers, Passenger, Tank Vehicle, Hazardous Materials, School Bus, and a combination of Tank Vehicle and Hazardous Materials. Each endorsement requires a specialized test.

The rule says

1. "An operator must obtain State-issued endorsements to his/her CDL to operate commercial motor vehicles which are: (1) Double/triple trailers; (2) Passenger vehicles; (3) Tank vehicles; (4) Used to transport hazardous materials as defined in 383.5; or (5) School buses." (49 CFR 383.93(b))

2. "The following tests are required for the endorsements contained in paragraph (b) of this section: (1) Double/Triple Trailers a knowledge test; (2) Passenger a knowledge and a skills test; (3) Tank vehicle a knowledge test; (4) Hazardous Materials a knowledge test; and (5) School bus a knowledge and a skills test." (49 CFR 383.93(c))

In plain English

These endorsements are required for specific types of vehicles or cargo, such as double/triple trailers, passenger vehicles, tank vehicles, hazardous materials, and school buses. Each endorsement has its own testing requirements, which can include knowledge tests, skills tests, or both. For example, a driver who wants to operate a tank vehicle needs to pass a knowledge test, while a driver who wants to operate a passenger vehicle needs to pass both a knowledge test and a skills test. The endorsements are issued by the state and are required in addition to the standard CDL.

What to do

• Verify the type of vehicle or cargo you will be operating to determine which endorsements are required.
• Check with your state's DMV to determine the specific testing requirements for each endorsement.
• Ensure you have the necessary endorsements on your CDL before operating a vehicle that requires them.
• Keep your endorsements up to date and renew them as required by your state.