To operate particular types of commercial motor vehicles (CMVs), commercial drivers need to obtain CDL endorsements. Class A CDL holders have access to the following CDL endorsements:

• H endorsement (Hazardous Materials)
• N endorsement (Tanker Vehicles)
• P endorsement (Passenger Vehicles)
• S endorsement (School Bus Transport)
• T endorsement (Double and Triples)
• X endorsement (Combination endorsement covering both Tanker and Hazardous Materials)

To obtain these endorsements, drivers need to pass additional written and sometimes skills tests. The requirements for obtaining these endorsements may vary by state, and there may be additional endorsements depending on the state.

Some endorsements like the “P” and “S” endorsements also require drivers to meet additional state-specific requirements, such as background checks and additional training. As of February 2022, the FMCSA has new updated guidelines for drivers looking to obtain their Hazmat, Passenger, or School Bus endorsement. FMCSA establishes new minimum training standards for certain individuals applying for their commercial driver’s license (CDL) for the first time; an upgrade of their CDL (e.g., a Class B CDL holder seeking a Class A CDL); or a hazardous materials (H), passenger (P), or school bus (S) endorsement for the first time.