What is one requirement for stopping a school bus on a highway?

One requirement for stopping a school bus on a highway is to activate warning signals in advance. This is crucial because the warning lights serve as a signal to both oncoming traffic and vehicles following the bus that it is about to stop to allow children to board or exit. By turning on these signals well ahead of the actual stop, the bus driver provides adequate notice to other drivers, ensuring they have time to react and slow down. This helps to prevent accidents and ensures the safety of children getting on or off the bus.

Visibility and positioning also matter when stopping a bus, but the primary requirement is to communicate the intent to stop through these warning signals, which enhance the safety of the operation. Ensuring that the bus is visible can be important, but it does not directly relate to the legal requirements for stopping procedures. Using emergency lights alone or stopping in the right shoulder without the proper signaling does not sufficiently alert other drivers, which could lead to dangerous situations. Thus, the activation of warning signals is a fundamental safety requirement when stopping a school bus on a highway.