Jarek 🚲
OK, passed by today, took photos of the signs. Turns out there are turn restrictions: http://imgur.com/a/u2jTJ

As far as I can tell, the line covered by sticker above Feuerwehr said "Anlieger", which would map to access=destination (but there are no destinations other than the fire station right now as the street is barred for construction).

Going by http://wiki.openstreetmap.org/wiki/Relation:restriction "If [the first word] is "only_", then you know that the only routing originating from the "from" member leads to the "to" member", the restriction relations as currently entered seem correct?

This is all under construction and appears somewhat informal (e.g. no exception for Feuerwehr on the Fahrzeugeverbot sign), so on one hand this isn't critical and on the other hand it should be monitored to see if it changes. But it appears correct as it is now.