Which personnel in public school districts are typically not directly supervised by the campus principal?

The answer focuses on bus drivers because they typically work under the transportation department of the school district rather than being directly supervised by campus principals. Bus drivers' roles are often managed at a district level, where they follow protocols and schedules set by transportation supervisors or managers. This separation of supervisory roles helps ensure that complex logistical operations can be handled efficiently across multiple campuses, as bus routes and schedules often involve coordination beyond just a single school.

In contrast, custodians, cafeteria workers, and volunteers generally operate within the realm of the campus. Custodians are responsible for maintaining the cleanliness and safety of the school environment, usually reporting directly to the principal or a designated school administrator. Cafeteria workers provide meals and are also typically overseen by school management to ensure compliance with health and safety standards. Volunteers work closely with educators and administrators to support various school activities and initiatives, making them an integral part of the campus environment.