[Tagging] Proposal of new tag for technicality of trails for running

[Volker Schmidt]

There is at least one other scale: cai_scale
<https://wiki.openstreetmap.org/wiki/Proposed_features/cai_scale> which is
similar in concept to sac_scale,but is applied to hiking relations. It's
increasingly used in Italy.

On Mon, 18 May 2020 at 16:48, Daniel Westergren <westis at gmail.com> wrote:

> Hi there,
>
> I would like to discuss the possibility of a new tag, trail_technicality,
> to be used on ways with highway=path.
>
> One way this can be used is aid in finding trails to run on and to get
> suggested routes with tools like Trail Router (www.trailrouter.com),
> Komoot (www.komoot.com) or Open Route Service (
> https://maps.openrouteservice.org/).
>
> *What tags are already available?*
> *sac_scale *is the obvious choice to determine trail difficulty. But it's
> geared towards mountain trails and I doubt it's being used much outside of
> mountain trails.
>
> *mtb:scale* is closer to what I'm proposing, but geared towards
> single-trail technicality for MTB, not for running (or hiking).
>
> Then there's *surface*, *width*, *trail_visibility*, *smoothness *(for
> wheeled vehicles) that can all be used to determine what kind of path it
> is, but they don't really tell anything about the technicality of
> single-trails.
>
> *How to use the tag?*
> It would only be used for single-trails, that is in ways with
> highway=path. I don't have a set suggestion of values, but I'm thinking
> something similar to mtb:scale, basically with runnability as the
> determining factor. It would obviously leave room for subjective judgement,
> just like smoothness and trail_visibility. But with image examples and
> clear factors describing each value it would still give a lot of useful
> information to route planners and renderers.
>
> Some factors to determine values: stability/softness of surface, obstacles
> (rocks, roots etc.), running rhythm (short ups/downs, sharp turns etc.) and
> attention required.
>
> *Use-cases*
> As mentioned, trail_technicality could be used together with other values
> in route planners and renderers, to suggest routes based on user preference
> (technical trails <-> road running), but also to roughly estimate running
> time (in addition to elevation/slopes).
>
>
> What do you think?
>
> /Daniel Westergren
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