[Tagging] Seasonnal roads

[Eric Sibert]

> For mountain pass in Alps, this could be just
>
> access:conditional = no @ Nov-Apr

>
> That seems logical to me. One word on using "access:conditional" though -
> this would indicate no access, including on foot.

In somehow, we may consider that the road does not exist in winter due  
to the large amount of snow over it. I mostly use it during ski touring.

> For more details see [1]
> and [2]. Essentially there is a hierarchy of subcategories for
> transportation modes.
> [2] http://wiki.openstreetmap.org/wiki/File:Access_hierarchy_simple.png

This scheme should be more wildly used. It seems to be use only in the  
German wiki.


Eric