What are you required to do according to the following road sign?

1. A distance of about 250 meters to an approaching level crossing.
2. You should always stop at a distance of one meter before the level crossing.
3. Slow down and stop. Railway tracks 50 meters ahead.
4. Correct answer: Slow down and prepare to stop before the level crossing, if necessary.

WhyThis is the last warning before the tracks: slow down and stop before them if needed. You do not have to stop in every case.