In the presented situation, is the prohibition expressed by this sign binding from the place of its erection?

Description
§ 15 para. 2 of the Regulation of the Ministers of Infrastructure and of Internal Affairs and Administration of 31 July 2002 on road signs and signals (Journal of Laws No. 170, item 1393, as amended).
Explanation
Correct answer: Yes
Yes. The displayed 30 km/h limit applies from sign B-33. Slow down to that speed before passing the sign. A T-21 plate could indicate the distance to where a restriction begins, but no such plate is shown here.