What should a heavy truck driver do before crossing a railway level crossing without automatic barrier gates?

1. Stop, look both ways, listen for train horns, confirm there is sufficient clear space across the tracks to fit the entire truck length, and cross in a low gear without shifting gears on the tracks
2. Accelerate in top gear and shift gears rapidly across the tracks
3. Stop directly across the railway tracks and wait for the train to pass
4. Sound the horn continuously and cross without looking