What do alternating flashing amber lights on a school bus mean?

• That the school bus is going to start flashing alternating red lights and will stop to allow students to get on or off.
  Explanation:

  "Flashing amber lights on a school bus serve as a warning that the bus is about to stop and activate its red lights. When the red lights start flashing, the bus is stopping to let students board or exit, and you must be prepared to stop."
• That the school is nearby.
• That the school bus is going to speed up and overtake you.
• None of the above.