Are you warned in this situation of a 1.2 km-long rough roadway beyond this sign?

Description
§ 7 para. 1 and 3 para. 5 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. Sign A-11 warns of an uneven road, and the T-2 plate gives the length of the affected section: 1.2 km. This is the length of the hazardous section, not the distance from the sign to its beginning.