I am tagging according to the general Belgian rule: everything that is not forbidden is allowed. If there is a traffic sign prohibiting access for bicycles it should be tagged as bicycle=no. If there isn’t, then access for bicycles is assumed. I am also concerned that if trails suitable only for mountain bikes are tagged as bicycles=yes that other route planners select these trails for regular bikes too. Since a while now I’ve been giving more attention to road quality with adding the tag “smoothness” to make clear what to expect from a road.
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