On Tue, 21 Apr 2020 at 03:42, Martin Koppenhoefer <dieterdre...@gmail.com>
wrote:

> Did you consider mtb=designated?
>

This was considered and mentioned in the rationale, mtb as a key is better
use as a mode specific access tag, which makes mtb=designated to usually
mean signposted or otherwise indicated for use by mountain bikes, its a
more formal endorsement that the way is for use by that mode.

Sometimes mountain bike tracks are evident as such on the ground due to
track construction and common usage, but have no signage or other
indication that they are for use by mountain bikes so I think
mtb=designated would be a mis-step in that case as it says it's officially
designated which it's not.

Secondly because you might have other highway types like highway=track
which are signposted as for use by mountain bikes you'd have
highway=track + mtb=designated, but it's still a highway=track not a
singletrail mountain bike track.

Are there implications for pedestrians, riders and "other" cyclists?
> Motorbikes? (Question is, are they allowed, not allowed, or maybe allowed
> in absence of explicit specific access tags?)
>

I believe it's always better to explicitly tag the access tags to indicate
who can use the way, so I'd always encourage setting foot= and bicycle=
(mountain bikes are a type of bicycle so usually the legal restriction
applies to any kind of bicycle) Data consumers would need to decide what
defaults they could use if not supplied, that would be their chose, a
mapper shouldn't rely on this default. Personally I'd assume foot=yes,
bicycle=yes, horse=no, motorbike=no as defaults where you only have
highway=path + path=mtb.
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