Heartsaver First Aid Part I Progress Indicator: Question 3 of 22 3.  WHEN APPROACHING A STOPPED SCHOOL BUS WITH ITS RED LIGHTS FLASHING AND ITS STOP ARM EXTENDED, YOU MUST: Choices: Stop 5 feet away from the bus Stop only if you see children are present Stop and remain stopped until it appears safe to proceed Stop and remain stopped until the red lights stop flashing and the stop arm has been withdrawn