When should you stop for a school bus?

Stopping for a school bus is critical for the safety of children boarding or disembarking. The correct answer indicates that you must stop when the bus's red lights are flashing. This signal indicates that the bus is either picking up or dropping off students, and it is a requirement by law to come to a complete stop.

Stopping in this situation ensures that children can safely cross the road without the risk of being struck by a vehicle. It is important to remain stopped until the red lights stop flashing and the bus has deployed its stop sign back. This rule helps to create a safe environment for children as they enter or exit the bus, as they may not be aware of their surroundings or the potential dangers.

The other options present scenarios that do not emphasize the critical safety measures required when dealing with a school bus, making it imperative to always prioritize stopping for the flashing red lights.