According to Article 47 of the Road Traffic Safety Law of the PRC, when a passenger bus approaches a crosswalk (pedestrian crossing) where pedestrians are crossing, what must the driver do?

1. Accelerate and honk to urge pedestrians to clear the crossing quickly
2. Stop the vehicle before the stop line and yield right-of-way until pedestrians have passed safely (减速停车，避让行人)
3. Maneuver around pedestrians through the opposing lane to maintain bus timetable punctuality
4. Flash high beams continuously and proceed as long as pedestrians are not directly in front of the bumper