What must be covered when transporting non-students in a school bus?

When transporting non-students in a school bus, it's essential to focus on the operational signals and safety equipment that ensure the vehicle is recognizable and compliant with safety regulations. Red amber lamps serve a critical role in indicating the bus is engaged in passenger loading or unloading activities. These lamps are an important part of the bus's signaling system, alerting other drivers to the presence of the bus and its activity, which is vital for safety on the road.

Utilizing the red amber lamps also aligns with legal requirements that govern the operation of school buses, reinforcing the visibility of the vehicle during these times. This is particularly important when non-students are being transported, as it maintains awareness and focus on the fact that there are passengers on board, even if they are not school-aged students.

Although the other options like emergency exit doors, the school bus sign, and stop sign arm are important components of a school bus, they do not specifically pertain to the act of signaling when transporting non-students as much as the red amber lamps do.