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CDL Endorsements

An endorsement is an extra qualification stamped onto your CDL that lets you haul or drive special loads. Each one needs its own short knowledge test, and some need extra background or skills steps.

H Hazardous Materials (H)

Required to transport hazardous materials in amounts that require placarding. Includes a TSA Security Threat Assessment.

TSA background check
N Tank Vehicle (N)

Required to drive a tank vehicle carrying liquid or gaseous cargo.
P Passenger (P)

Required to drive vehicles designed to carry 16 or more passengers (including driver).

Plus skills test
S School Bus (S)

Required to drive a school bus. Stacked on top of the Passenger (P) endorsement. Additional fingerprint + background check.

Plus skills test
T Doubles / Triples (T)

Required to pull two or three trailers behind a Class A combination vehicle.
X Hazmat + Tank (X)

Combined H + N endorsement for drivers who haul hazardous materials in tank vehicles.

TSA background check

Endorsements are defined in 49 CFR §383.93 ecfr.gov · §383.93 and (for HazMat) the TSA Security Threat Assessment program.