Are you allowed to stop the vehicle on the hard shoulder in this situation?

In the photo you are driving on a road outside a built-up area; the right edge of the roadway is marked by broken edge line P-7a, and beyond it there is an unpaved shoulder. Stopping the vehicle on such a shoulder is allowed. The answer is: yes.

The Regulation on road signs and signals states that line P-7a marks the edge of the roadway, and a ban on driving onto the shoulder comes only with solid line P-7b. The Road Traffic Act allows stopping in a place where the vehicle is visible from a sufficient distance and does not cause danger or obstruction, and outside a built-up area a parked vehicle should, if possible, stand off the roadway - that is, on the shoulder. You must not stop on the roadway next to the broken line that marks its edge, so you pull onto the shoulder with the whole car.

Legal basis: Art. 46 para. 1 and 3 and Art. 49 para. 1 point 5 of the Road Traffic Act (Prawo o ruchu drogowym); § 86 para. 8 of the Regulation on road signs and signals