In the situation shown, are you in front of a single-rail level crossing?

In the photo you are driving along a street in a town behind a dark car and approaching a level crossing without barriers; on the right, in front of the tracks, there is a double St Andrew's cross with unlit lights and sign B-20 "STOP", and on the left, beyond the tracks, there is the same cross facing away from you, for oncoming traffic. The double cross is sign G-4 - you are not in front of a single-track crossing, but a multi-track one. The answer is: no.

The Regulation on road signs and signals states that sign G-3 "St Andrew's cross in front of a single-track level crossing" and sign G-4 "St Andrew's cross in front of a multi-track level crossing" mark the place where you stop because of the movement of a train or other rail vehicle at a crossing without barriers or half-barriers; G-3 is a single cross (one pair of arms), and G-4 is a double cross (two pairs of arms, one above the other). The number of tracks matters: after one train has passed, another may come on the second track from the opposite direction, and a standing train blocks the view of the neighbouring track. Sign B-20 additionally requires you to stop in front of the tracks. You stop in front of the cross, look and listen in both directions, and move off only when both tracks are clear.

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