A bus approaches a railroad crossing with a traffic signal just beyond the tracks and traffic backed up past the signal. What is the correct decision if the bus cannot fit beyond the tracks?

1. Do not commit to the crossing until there is enough space for the entire bus plus the safety margin to clear the tracks
2. Stop with the rear of the bus on the tracks and wait for the signal
3. Enter the crossing because the bus stopped 15 to 50 feet before the rail first
4. Ask students to watch for trains while the bus blocks the tracks