Final answer:
When you see a school bus with red flashing lights, you must stop and remain stopped until the lights are turned off and the bus starts moving again. This rule is for the safety of children and is usually enforced by law.
Step-by-step explanation:
If you are in front or behind a school bus with red flashing lights, it is crucial to stop your vehicle. This safety rule is designed to protect the safety of children boarding or deboarding the bus. The lights indicate that the bus has come to a halt, and children may be crossing the road. In most regions, it is not only a safety precaution but also a legal requirement to stop your vehicle and not proceed until the red flashing lights are turned off and the bus resumes movement. The only exception to this might be if you are on the other side of a divided highway; specific laws can vary, so always be familiar with the local regulations.