In most areas, what should you do when approaching a school bus that has stopped with its red lights flashing and stop arm extended?

When a SCHOOL BUS is stopped with RED lights flashing and the STOP ARM extended, you must STOP and remain stopped until the red lights stop flashing and the stop arm is withdrawn — because children may be CROSSING the road. DMV/permit test. This applies to traffic in BOTH directions on most roads (on a DIVIDED highway with a median, traffic on the OTHER side of the barrier generally may not need to stop — varies by state). Illegally passing a stopped school bus is a serious offense endangering children. AMBER/yellow flashing lights mean the bus is about to stop (prepare to stop). Knowing to stop for a school bus with flashing red lights is a critical, commonly tested law.