Which signal indicates the presence of children loading or unloading near a bus?

Answer: A — Amber lights flashing near the top of the bus

The signal that shows children are loading or unloading near a school bus is the red flashing lights on the bus (usually with the stop arm extended). When these lights are flashing, drivers must stop because children may be crossing and entering or leaving the bus. Amber lights, which flash on top before the red lights, warn that the bus is preparing to stop and drivers should slow down and be ready to stop. Green or white lights aren’t used to indicate loading or unloading. So, red flashing lights are the clear cue that children are actively loading or unloading near the bus.