Jarek 🚲
Sorry, ich kann das besser auf englisch:

I guess this refers to http://www.openstreetmap.org/relation/2612758 and http://www.openstreetmap.org/relation/2612760

Currently, the stretch of Rüdersdorfer Str leading to the fire station is marked as "no traffic" (Zeichen 250, Verbot für Fahrzeuge aller Art) with a sign, as I recall, excepting Feuerwehr and access to the fire station. (I will check exactly next time I can pass.) There are, however, no explicit turn restriction signs that I recall.

The situation has likely changed since the Abbiegebeschränkugen were entered in OSM 4 years ago, due to the watermain construction in Rüdersdorfer Str. With http://www.openstreetmap.org/way/24021332 being tagged as access=no + motor_vehicle=destination, thus reflecting the Fahrzeugeverbot, perhaps the two turn restrictions can just be deleted? Situation can then be revisited when the construction ends.