ICBC Class 4 Knowledge Practice Exam - Prep & Practice Questions

A school bus cannot move until the kids are seated because the safety of the passengers is the top priority when it comes to transporting children. A seated position helps ensure that children are less likely to be injured in the event of sudden stops or collisions. This safety measure is particularly important in a vehicle as large as a school bus, where the dynamics and potential for movement can be quite different compared to smaller vehicles.

While having the kids inside the bus is essential for transportation, the requirement for them to be seated specifically addresses their safety during the journey. Seatbelts are not required on all school buses, and windows being closed, while it might be a consideration for noise or safety in some contexts, is not a universal requirement for moving a bus. Therefore, ensuring that all children are securely seated is the definitive condition that must be met before the bus can safely depart.