Should you exercise extreme caution in this situation?

In the video, you are approaching a level crossing in a town; on the right there is sign B-20 "STOP", and you can see the tracks, a fence and buildings. You should exercise particular caution. The answer is: yes.

The Road Traffic Act requires a driver, when approaching and going over a level crossing, to exercise particular caution, and before driving onto the tracks to make sure that no rail vehicle is approaching and to take appropriate precautions, especially if visibility is reduced by fog or for other reasons. The Regulation on road signs and signals adds that sign B-20 placed before a level crossing means that you must stop before it. Even when the barriers are up, your safety depends on your attention: a train cannot give way to you, and its braking distance is measured in hundreds of metres. Particular caution here means specific actions: you stop before the stop line, at a place from which you can see the tracks in both directions, switch off the radio, open the window or at least look carefully both ways along the tracks, and you drive onto the tracks only when nothing is coming and there is room beyond the crossing to leave it straight away.

Legal basis: Art. 28 para. 1 and para. 3 point 2 of the Road Traffic Act (Prawo o ruchu drogowym); § 21 para. 1 and 4 of the Regulation on road signs and signals