In the presented situation, do you have the right to enter the level crossing without stopping after making sure that no rail vehicle is coming?

In the video you are approaching a level crossing on a bend outside town; on the right there is sign B-20 "STOP" placed below a St Andrew's cross, and the word STOP is painted on the roadway. You are not allowed to drive onto the crossing without stopping, even if you make sure that no train is coming - sign B-20 requires you to stop in every case. The answer is: no.

The Regulation on road signs and signals states that sign B-20 means that you are not allowed to enter a junction without stopping before the priority road, and that you must give way, and that these rules apply accordingly to sign B-20 placed before the tracks of rail vehicles; the road marking P-16 "STOP" on the roadway confirms the vertical sign. The Road Traffic Act also requires you to exercise particular caution when approaching a level crossing and, before driving onto the tracks, to make sure that no rail vehicle is approaching. Stopping is not a formality: a train is quiet, and because of the bend and the trees you can see the tracks only from close up. You stop at the STOP marking, look and listen in both directions and move off when you are sure that nothing is coming.

Legal basis: § 21 para. 1 and 4 and § 89 para. 4 of the Regulation on road signs and signals; Art. 28 para. 1 of the Road Traffic Act (Prawo o ruchu drogowym)