There's no widespread use yet. Wiki has no clear suggestion. I distilled
highway=path
snowshoe=yes
_or_
highway=path
snowshoe=designated
access=no
{for exclusivity osm.wiki/Tag:access%3Ddesignated}
and optional:
relation=route
route=snowshoe
name=....
Diskussioun
Bemierkung vum Kevin Steinhardt de(n) 26. Dezember 2009 um 15:23 Auer
Just one question: what's a snowshoe? :P
Bemierkung vum bass de(n) 26. Dezember 2009 um 21:21 Auer
http://www.usscouts.org/clipart/library/WOSM/Canada/General/snowshoe.gif
Bemierkung vum Skippern de(n) 26. Dezember 2009 um 22:06 Auer
snowshoe=designated (when wearing snowshoes you are obligatory to use this route even if alternatives exists)
snowshoes=yes (you are allowed to use this with snowshoes)
snowshoes=no (you are not allowed to use this with snowshoes)
The only sane usage I can see with this is together with ski-tracks, where I would understand usage of snowshoes might damage the prepared tracks, and therefor prohibited or regulated in some way. If it is a regular "snowshoe walking route" or "snowshoing event" than relation=route should be used.
Bemierkung vum Iridium de(n) 4. Januar 2010 um 07:51 Auer
Of course, I thought of routes that only exist when there is snow that are only doable with snowshoes. Well you could do on foot, but would sink like knee deep into snow... otherwise a simple "snowshoe=yes" on whatever would be enough.