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

• That the school bus is going to speed up.
• That the school bus is going to slow down.
• That the school bus is going to stop to allow students to get on and off.
  Explanation:

  "Flashing alternating red lights on a school bus indicate that the bus is stopping to allow students to get on or off. You must stop your vehicle in both directions when these lights are flashing."
• It can mean any of the above.