Does the speed limit you see here apply only to the nearest intersection?

Why?

The number 40 inside a red circle on a rectangular panel identifies sign B-43, a speed limit zone. The restriction applies throughout the zone, so a junction does not cancel it. Sign B-44 marks the exit from the zone.

§ 31 ust. 1 i 3 rozporządzenia w sprawie znaków i sygnałów drogowych