Do you always have to stop before you enter a railway crossing marked with this sign?

Why?

The visible A-9 sign warns of a railway crossing with barriers, but the sign itself does not require you to stop. You must take particular care and check that no train is approaching and that you can cross safely. You must stop when signals, barriers, other signs or conditions at the crossing require it.

Znak A-9, § 6 ust. 1 rozporządzenia w sprawie znaków i sygnałów drogowych; art. 28 ust. 1 Prawa o ruchu drogowym