Under Article 48 of the Road Traffic Safety Law Implementation Regulations, what lighting rules must a bus driver follow when meeting an oncoming vehicle at night on an unlit road?

1. Switch from high beams (远光灯) to low beams (近光灯) at least 150 meters away from the oncoming vehicle
2. Keep high beams on continuously to ensure the bus driver maintains maximum forward visibility
3. Turn off all headlights and operate solely on parking lights to avoid dazzling the oncoming driver
4. Switch to emergency hazard flashers and accelerate past the oncoming vehicle