What is the correct procedure for stopping a commercial vehicle at a railway crossing (cruce ferroviario) in Chile?

1. Drive across at top speed without looking
2. Stop completely before the stop line or crossing signal, look both directions down the tracks, listen for train horns, verify that there is sufficient clearance on the other side to clear the entire vehicle and trailer, and cross in a low gear without shifting gears on the tracks
3. Shift into neutral and coast across the tracks
4. Stop directly with the trailer resting over the railroad tracks