Are you allowed in this situation to use all lanes along the entire width of the roadway?

In the photo you are driving along a street where a temporary yellow double solid line runs along the roadway, and on the right there is sign A-30 with the plate "Niewidomi" (blind people). The yellow line P-4 separates the directions of traffic, so you can only use the lane on its right side, not the whole width of the roadway. The answer is: no.

The Regulation on road signs and signals states that P-4 separates traffic lanes for opposite directions and forbids crossing it, and when white and yellow signs contradict each other, the yellow ones apply. The Road Traffic Act also requires right-hand traffic and driving as close as possible to the right edge of the roadway. The left part of the roadway beyond the yellow line belongs to oncoming traffic, even if it looks empty.

Legal basis: § 85 para. 3 and § 86 para. 5 of the Regulation on road signs and signals; Art. 16 para. 1 and 4 of the Road Traffic Act (Prawo o ruchu drogowym)