Le jeudi 29 octobre 2009 à 13:22, Richard Weait a écrit :
> We aren't really discussing the main building in this case are we?
> More like an awning or a car port?  How do we generalize this so that
> it applies in a sensible range of use cases?  Multi-lane drive-up
> banks and multi-lane gas stations come to mind as well as drive-in
> restaurants. [1]

And even restaurant over motorways, see this one
http://maps.google.com/?ie=UTF8&ll=50.654555,5.710015&spn=0.004673,0.008873&t=k&z=17
which doesn't show very well in OSM either
http://osm.org/go/0GAA7tEY1-

> I suggest that any tagging on the way should be reduced.  With the
> exception perhaps of maxheight. Leave layer for when a motorway passes
> over a carport access road.

Why limit layer usecase to roads?
It seems appropriate for any features laying at different altitude on the 
same (horizontal) position.
And the wiki page[1] says that it can be used for area as well, only 
landuse-like areas are excluded.

[1] http://wiki.openstreetmap.org/wiki/Key:layer

-- 
Renaud Michel

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