What must a school bus do when it is picking up or dropping off children?

When a school bus is picking up or dropping off children, it must stop to ensure the safety of the children boarding or disembarking. This stopping allows children to enter or exit the bus safely without the risk of traffic driving by at high speeds. The law requires vehicles approaching a stopped school bus to come to a complete stop and refrain from passing, creating a safe environment for students. This is crucial because children may be unpredictable as they approach or leave the bus, increasing the need for caution from all drivers in the vicinity.