[Tagging] Tagging detail on Rest Areas

[Warin]

Hi,

I have come up with some detail tagging for rest areas but want to get 
some oversight on it and help with one aspect.

http://wiki.openstreetmap.org/wiki/Tag:highway%3Drest_area

Easy(?) Details

Some of these have time limits - easy enough to use a conditional max 
stay tag

  rest_area:condition:maxstay=20

Stops people 'camping' over a long period.

Restricted to HGV use only, use access tags

  access <http://wiki.openstreetmap.org/wiki/Key:access>=no 
<http://wiki.openstreetmap.org/wiki/Tag:access%3Dno>  withhgv <http://wiki.openstreetmap.org/wiki/Key:hgv>=yes 
<http://wiki.openstreetmap.org/wiki/Tag:hgv%3Dyes>


More difficult detail

One I am having problems with, where they can be used for 'camping' with a caravan/camper-van (but probably not a tent).

rest_area:camping=caravan

or

rest_area:camping:caravan=yes

would convey the meaning .. but is it a 'good' tag that would allow for other things and follow other tagging methods?

caravan=yes could simply mean access and not convey the camping aspect? 
Note the max stay would still apply (if there).


Any thoughts on tagging these features for rest areas?


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