Upon meeting a school bus that has stopped on the highway with its red lights flashing, a driver coming from either direction must:

1. Stop before reaching the bus and not proceed until the bus has resumed motion.
2. Stop before reaching the bus and not proceed until the red lights have stopped flashing.
3. Stop before reaching the bus and proceed when all children have loaded or unloaded the bus.
4. Stop and not proceed until the bus has left the street.