A bus is stopped 20 feet before a railroad crossing. The driver opens the forward door to improve hearing, sees one train pass, then notices another track. What should happen next?

1. Check carefully for another train before crossing and avoid shifting on the tracks
2. Start across as soon as the first train clears because the stop was legal
3. Shift gears on the nearest rail to accelerate faster
4. Stop on the first track to get a better view of the second track