[Tagging] proposed routes, state-tag

[Martin Koppenhoefer]

We have some suggestions how to map features in construction, proposed
features and abandoned / disused features. To avoid misinterpretation
by "simple" data consumers, and to avoid that an additional attribute
changes the overall meaning of a tag (existing feature vs.
non-existing feature) we have in the past elabourated a tagging system
for roads under construction and for proposed roads, that serves these
intentions well: we use

highway=proposed / construction

together with
proposed=primary/motorway/...
or
construction=primary/cycleway/...

Now looking at routes the preferred tagging suggested in the wiki is different:
it is suggested to tag all routes the same way, regardless if they are
signposted, existing or simply proposed, and then differentiate just
by an additional key ( state ).

This tag is somehow established:
http://taginfo.openstreetmap.org/keys/state#values

But I'd like to propose to adopt the scheme to that of highways and
change the tagging to:
route=proposed
proposed=bicycle (for instance).

What do you think?

cheers,
Martin