Are you allowed in this situation to turn right onto the presented road?

In the photo you are driving along a street in the city centre past historic tenement houses; on the right there is a side street with sign B-2 "no entry" at its mouth, and a silver car is just coming out of it; further on, already next to your roadway, there is sign D-3 "one-way road", so it is also a one-way road. You are not allowed to turn right into this road. The answer is: no.

The Regulation on road signs and signals states that sign B-2 "no entry" means that vehicles are prohibited from entering the road or roadway from the side where the sign is placed; this sign is put up at the exit end of a one-way road so that nobody drives into it against the flow of traffic. Turning right would mean driving head-on towards vehicles leaving this street, including cars parking along it, whose drivers do not expect anyone coming from the opposite direction. When you see the mouth of a street with a round red sign with a white horizontal band, you continue straight on and look for the correct entrance into this street from the other side - where sign D-3 with a white arrow stands at its beginning.

Legal basis: § 17 para. 1 and § 44 para. 1 of the Regulation on road signs and signals