text: There is a "only_left_turn" sign from Bleibtreuplatz (see http://i.imgur.com/WlebGrM.jpg, pic from 10 m west of this note). According to http://wiki.openstreetmap.org/wiki/Relation:restriction ("There is no need to restrict turning into the wrong way of a one way street") I would suggest this can remain like it is mapped now.