According to Article 46 of the Road Traffic Safety Law of the PRC, how must a commercial passenger bus navigate an uncontrolled railway level crossing (无人看守的铁路道口)?

1. Accelerate to cross the tracks as rapidly as possible before any train appears
2. Come to a complete stop before the tracks, look left and right, listen carefully, select a low gear, and cross steadily without shifting gears or stopping on the tracks ('一停、二看、三通过')
3. Follow the preceding vehicle closely bumper-to-bumper across the tracks
4. Honk continuously and coast over the tracks in neutral gear