Under Washington loading rules, when the posted speed limit is 35 mph or less, when should the driver activate the alternating flashing amber lamps before a roadway stop?

1. Only after the bus has completely stopped
2. No less than 100 feet and no more than 300 feet from the stop
3. No less than 300 feet and no more than 500 feet from the stop
4. Only after the red lamps are already flashing