Final answer:
A school bus flashing amber lights is indicating that it will soon stop to load or unload children. Motorists should slow down and prepare to stop for student safety.
Step-by-step explanation:
When you see a school bus with flashing amber (yellow) lights, it generally means that the bus driver is signaling to other motorists that the bus will soon be stopping to load or unload school children. These flashing lights are a safety measure designed to alert drivers to slow down and prepare to stop, so children can safely enter or exit the bus. This is a critical road rule that helps ensure the safety of students as they travel to and from school.