What is a CDL passenger endorsement?

A commercial driver's license with a passenger endorsement allows the bearer to drive a vehicle that has 16 or more occupants, including the driver. This endorsement requires passing a special test in addition to the general driving test.

Questions on the test for a passenger endorsement have to do with managing a bus and dealing with passengers. CDL passenger endorsements require mastery of skills such as what to do when a passenger becomes disruptive, the best way to deal with a disabled bus, the causes of buses leaning when running on a banked curve, and requirements for stopping the bus near railroad crossings.