Are you obliged, on an internal road marked with the relevant road sign to adhere to the road signs presented here?

In the photo you are driving along a narrow street in a housing estate between blocks of flats; on the right there is a white rectangular sign with the words "Droga wewnętrzna" (internal road) - D-46 - and further on sign B-35 "no parking" with a plate. On an internal road marked with this sign, you must obey the road signs placed on it. The answer is: yes.

The Road Traffic Act sets out the rules of traffic on public roads, in residential areas and in traffic zones (strefa ruchu), but it also states that its rules apply to traffic outside these places to the extent necessary to avoid a danger to people's safety and to the extent resulting from road signs and signals. The Regulation on road signs and signals states that sign D-46 "internal road" marks the beginning of a non-public road open to general traffic. So since the estate manager has put up sign B-35, it applies in the same way as on a public street. On an internal road outside a traffic zone, the rules of the Act apply only to the extent resulting from signs and necessary for safety, so the general right-of-way rules may not apply there - you drive slowly and carefully, as if anyone could have right of way.

Legal basis: Art. 1 para. 1 point 1 and para. 2 of the Road Traffic Act (Prawo o ruchu drogowym); § 58 para. 5 of the Regulation on road signs and signals