text: thanks, I'll work on this one in the next days, as I guess this whole route between Paeroa and Waihi is a dedicated cycleway, and then it should be tagged as cycleway, not as a multiple dirt road (highway=track) section.
  Do you know this area? do you confirm this whole section is only for cyclists and hikers?
  https://www.openstreetmap.org/directions?engine=graphhopper_bicycle&route=-37.3919%2C175.6754%3B-37.3987%2C175.8327#map=12/-37.4066/175.7541&layers=C
  
  Thanks!