In the visible situation, do you have priority over the vehicle travelling on the transverse roadway?

In the photo you are driving along a street in a town behind a red minibus that has stopped before the junction; on the right there is sign B-20 "STOP", and cars are passing along the side roadway. You do not have right of way over a vehicle travelling along the side roadway - the STOP sign requires you to stop and give way. The answer is: no.

The Regulation on road signs and signals states that sign B-20 "STOP" means a ban on entering the junction without stopping before the priority road and an obligation to give way to drivers travelling along that road. The STOP sign is the strictest way of marking a road as minor: it is placed where visibility is so limited that just slowing down is not enough to judge the traffic on the main road. Giving way means that you must not move off if you would force someone on the intersecting road to brake or change direction. You wait behind the minibus, then move up to a point from which you can see the side roadway, stop completely, check both sides and enter only when the road is clear.

Legal basis: § 21 para. 1 and 2 of the Regulation on road signs and signals; Art. 2 point 23 of the Road Traffic Act (Prawo o ruchu drogowym)