text: Why does the Mapzen bicycle routing suggest a detour when going from south to north on the Recollettenlei? Is it because of the tagging or because of Mapzen's algorithm?
  Example:
  http://www.openstreetmap.org/directions?engine=mapzen_bicycle&route=51.04926%2C3.71967%3B51.05044%2C3.71979#map=18/51.04976/3.71923&layers=N