[Talk-us] Separate relations for each direction of US & State highways.

Paul Johnson baloo at ursamundi.org
Sat Jan 11 12:36:13 UTC 2014

I'm curious how this proposal works with roads like the northern section of
the Muskogee Turnpike, which officially runs "North" towards Tulsa, and
"East" towards Muskogee, the road's two terminii.

On Fri, Jan 10, 2014 at 4:39 PM, Martijn van Exel <martijnv at telenav.com>wrote:

> On Thu, Nov 21, 2013 at 1:27 AM, Chris Lawrence <lordsutch at gmail.com>
> wrote:
> > For example: way X pointing east is marked in relation Y as "east"
> > (presumably we could assume that "east" = forward and the opposite
> cardinal
> > direction "west" is backward). User reverses way X. Now the relation
> role is
> > potentially backward.  JOSM seems to understand at least north/south and
> > east/west and offers to fix it (see
> >
> http://josm.openstreetmap.de/browser/josm/trunk/src/org/openstreetmap/josm/corrector/ReverseWayTagCorrector.java
> );
> > no idea if iD or Potlatch do.
> >
> > We'd also need to make the validation tools smarter to recognize lossage
> > (for example, realizing that the route is unbroken only if the chain of
> role
> > tags once you account for the directions of the underlying ways is
> > monotonic),
> Picking up on this old thread again. The status is now that iD
> partially supports the cardinal directions when reversing a way (it
> does not understand things like north:unsigned, not sure if that is
> easy to fix)
> JOSM understands 'north' as well as 'north:unsigned' (and the other
> cardinal directions of course) when flipping a way and offers to
> correctly fix the member role.
> Relation sorting does not seem to take the member role into account in
> JOSM, so that bit is not affected (or am I overlooking something?)
> The relation graph column in the relation editor does not recognize
> cardinal directions in the same way it recognizes forward / backward
> (with the dotted line display).
> The main thing I haven't looked into yet is the validation checks. Who
> knows which validation checks are run on relations in JOSM and/or iD
> to ensure 'unbroken-ness' and perhaps other things?
> --
> Martijn van Exel
> OSM data specialist
> Telenav
> http://www.osm.org/user/mvexel
> http://wiki.openstreetmap.org/wiki/User:Mvexel
> http://hdyc.neis-one.org/?mvexel
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