What Are Endorsement Codes and When Do I Need Them on my CDL?

Endorsements are necessary for certain commercial driving requirements as follows . . .

• AIR BRAKES endorsement for vehicles with air brakes.

• (T) DOUBLE or TRIPLE TRAILERS. For tractors pulling two or three trailers.

• (P) PASSENGER. For vehicles which are designed to carry 16 or more people (including the driver);

• (S) SCHOOL BUS. Any vehicle transporting children to or from school and home regularly for compensation.

• (N) TANK VEHICLES. For vehicles designed to haul liquids or liquefied gases in bulk in permanently mounted tanks or portable tanks rated at 1,000 gallons or more.

• (H) HAZARDOUS MATERIALS. To carry hazardous materials in amounts requiring placards.

• (X) Endorsement code designating a Tank (T) vehicle that carries Hazardous Materials (H).