[Talk-us] Directions as route relation roles

Paul Johnson baloo at ursamundi.org
Tue Jul 11 09:57:53 UTC 2017

On Mon, Jul 10, 2017 at 9:56 AM, Albert Pundt <roadsguy99 at gmail.com> wrote:

> The wiki page Highway Directions In The United States lists a method of
> tagging directions in route relation roles that sets the role as the posted
> direction of the way in OSM's forward direction. For single-carriageway
> roads, this means that backwards is the opposite cardinal direction.
> Presumably two-way roads carrying only one direction of a route (which only
> exist in brief segments, but are common nationwide) are still given just
> "forward" and "backward". Or would multiple values be used, e.g.
> "north;forward"?

Wiki page could use some clarification.  Superrelations, where the members
are child relations, should have roles of
north/south/east/west/clockwise/anticlockwise as appropriate.   The child
relations (and routes with only one relation) should have forward/backward
if applicable; and if a child, then all members of the child will have
forward or backward, and the relation itself will have direction=* agreeing
with it's role in the superrelation.
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