In the presented situation, are you allowed to drive through the railway crossing without stopping?

In the photo, you are approaching a level crossing without barriers; on the right there are sign B-20 STOP, St Andrew's cross G-3 and sign G-2 "live overhead line" with plates. You are not allowed to drive across without stopping, even if you have already made sure earlier that no train is coming. The answer is: no.

The Regulation on road signs and signals states that sign B-20 means that you must not enter without stopping, and this rule applies accordingly to sign B-20 placed before the tracks of rail vehicles. Stopping is absolute and is there so that you can look both ways along the tracks calmly and without hurrying - a train may come out from behind a bend in a few seconds. You stop before the cross, look left and right, listen, and only then do you drive across, without stopping on the tracks.

Legal basis: § 21 para. 1 and 4 and § 78 para. 4 and 5 of the Regulation on road signs and signals; Art. 28 para. 1 of the Road Traffic Act (Prawo o ruchu drogowym)