[Tagging] access restrictions by emission class (cars), EURO 1, etc.

[Martin Koppenhoefer]

In Rome there a different zones (low emission zones and limited
traffic zones) which restrict the access of certain vehicle types,
based on a series of criteria (e.g. public transport or private
vehicle, resident with special permission or not, date and time (e.g.
restriction only on Friday and Saturday night), ...) and one
distinction made is that of the emission class of the vehicle (euro 0,
euro 1, euro 2, ...). Now to describe the access conditions in a
formal way we'd need to tag these emission classes. Has anyone already
something in use?

this is what I found in the wiki regarding the zones:
- http://wiki.openstreetmap.org/wiki/LEZ
- http://wiki.openstreetmap.org/wiki/Proposed_features/boundary%3Dlimited_traffic_zone

and regarding the restrictions:
- http://wiki.openstreetmap.org/wiki/Proposed_features/access_restrictions_1.5
(could maybe be extended for our purpose)


Cheers,
Martin