text: "No numeric speed value is set by law for Schrittgeschwindigkeit (walking pace speed). The value of around 7 km/h resulted from several judgements, most within the range of 7 to 12 km/h."
  -
  http://wiki.openstreetmap.org/wiki/Tag:highway%3Dliving_street#Germany
  -
  Also ist es grundsätzlich nicht falsch!!!
  