That will depend on the state or jurisdiction. Each gets to set their own penalties, but this tends to be very high.
You should remain stopped until the bus's red lights are no longer flashing.
Red lights flashing on a school bus mean remain stopped until they are turned off.
Stop until the red lights stops flashing
If it's a school bus, whenever the lights are flashing.
STOP!!
In California, the fine for passing a school bus that's stopped with flashing red lights is $1000.00
The bus stops flashing its red light and (if applicable) withdraws its stop sign.
the flashing lights are the fireflies or the beetles :)
$250
Wait for the train to go by or for the lights to turn off.
People with epilepsy can have their seizures triggered by flashing lights
The flashing lights on aircraft are anti-collision lights, so they can be seen more easily.