There is a proposed feature with this purpose:
http://wiki.openstreetmap.org/wiki/Proposed_features/Obstacle

Regards!

2013/10/3, Bryce Nesbitt <bry...@obviously.com>:
> In the case of a trail the landowner is actively trying to erase, I'll
> often draw the trail into osm, tag it discouragingly, and put barrier nodes
> at each end.  Across a wide variety of map rendering, this has a chance of
> communicating the intent of non-use.
>
> The downside of omitting, removing, or disusing the trail is that someone
> might physically see what's left and simply assume it's an unmapped route.
>
> ---
>
> In rock climbing routes, the entire route is graded according to the
> hardest move.
>
> Perhaps in the case of unmaintained (but legally open) trails, one could
> tag (and thus render) the trail condition based on the least passable
> section.  The utility of the route reduces to the ability to get over the
> (landslide, muddy part, weeds, washed out bridge).
>


-- 
*KONFRARE ALBERT*
La Konfraria de la Vila del Pingüí
de La Palma de Cervelló
www.konfraria.org • @La_Konfraria <http://twitter.com/La_Konfraria>

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