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"?
My question is whether this is actually commonly used. I haven't seen this method used anywhere, but then again I haven't really looked either. How widespread is this practice?
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