For example, in the United States, a CDL is required for any bus that can carry 16 or more passengers, including the driver. Additionally, a CDL is required for buses with a GVWR of 26,001 pounds or more.
The process for obtaining a CDL typically involves passing a written test, a driving skills test, and a vision test. The requirements for the written test and the driving skills test will vary depending on the jurisdiction.
It's important to note that the CDL requirements for school buses can vary, so it's important to check the specific regulations in the jurisdiction where you plan to operate the bus.