[Tagging] Marking dual carriageways

[Martin Koppenhoefer]

2014-07-10 12:20 GMT+02:00 Mateusz Konieczny <matkoniecz at gmail.com>:

> I am thinking about marking tagging roads with separate carriageways. I
> want to create map with oneway roads, but in OSM data roads with separate
> carriageways that are not oneway are frequently represented as separate
> ways, both tagged as oneway.
>
> Adding tag that that would describe way as part of dual carriageway, with
> twin road leading in opposite direction would allow to solve this problem.



you could also use the area-relation for this (and make this routable for
pedestrians without explicit connections, define implicitly the barrier
between the 2 carriageways, etc.):
http://wiki.openstreetmap.org/wiki/Relations/Proposed/Area

cheers,
Martin
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