Are you allowed in this situation to stop your vehicle on the hard shoulder immediately behind this sign if it does not impede the movement of other vehicles?

Why?

Immediately beyond the warning sign, a solid edge line still separates the shoulder from the carriageway. You must not stop on the shoulder beside this line. The prohibition applies even if you would not obstruct other traffic.

art. 49 ust. 1 pkt 5 Prawa o ruchu drogowym