My view based on current usage, reading of the wiki and general opinion is
that highway=cycleway is meant for any path that is either
designed/intended for bicycles or specifically designated (signposted) for
bicycles, irrespective of if it's an urban track or mountain biking track.

So a mountain bike track and an urban cycle track should both be tagged
with highway=cycleway as the primary tag. surface= and smoothness= can help
for both to help guide users on which kind of bicycle the track is suitable
for, and mtb:scale=/mtb:scale:imba= are used to indicate this is a
designated mountain biking track.

highway=path is specifically for a general use / unspecified path, which a
mountain biking track may be if it's informal/shared, but purpose built and
signposted mountain bike tracks don't fall into that category.

A similar thing applies to hiking tracks, sometimes they are designated
walking paths so use highway=footway + surface + sac_scale, but sometimes
they are just an unmarked or mixed use path so are highway=path + surface +
sac_scale.

Open to other opinions or comments.

On Thu, 2 Apr 2020 at 18:56, Phyks <ph...@phyks.me> wrote:

> Hi,
>
> A discussion in CyclOSM issue tracker [1] spotted that there exists
> around 3500 highway=cycleway around the world which have specific
> mountain bikes (MTB) tags. In particular, around 800 highway=cycleway
> around the world declare a mtb:scale greater than 2, which would make
> them impassable without a proper mountain bike. Such cycleways would not
> be passable with a regular city bike. One example of such a case is at [2].
>
> Looking at the wiki page [3],
> "the highway=cycleway tag indicates a separate way for the use of cyclists"
> which does not mandate explicitly that a cycleway be accessible with any
> kind of bikes and should also cover dedicated paths for MTB. However,
> the documentation around cycleways and bike features is very oriented
> towards city cycling and there is no illustration about MTB-specific
> cycleways.
>
> So, is this considered a valid tagging or should it be represented by
> another highway class (path, track, etc)? If this is valid, I propose to
> add a statement in the wiki explicitly mentioning that cycleways can be
> restricted for specific kinds of bicycles, for future questions.
>
> Best,
>
> [1] https://github.com/cyclosm/cyclosm-cartocss-style/issues/208
> [2] https://www.openstreetmap.org/way/86978431#map=17/41.26426/-73.91907
> [3] https://wiki.openstreetmap.org/wiki/Tag:highway%3Dcycleway
>
> --
> Phyks
>
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>
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