If a vehicle stalls and is immobilised on a railway level crossing, what is the driver's first and most urgent obligation?

1. Lock the car and leave to search for a mechanic.
2. Immediately discharge all passengers from the vehicle, take all possible measures to clear the vehicle off the tracks, and send people at least 1,000 meters in both directions along the rails to give stop signals.
3. Sit in the vehicle and turn on the radio.
4. Try to restart the engine for 30 minutes before doing anything else.