Track is used more and more for unpaved roads. Mapnik and other renderers are probably a big reason, because they don't render Surface<http://wiki.openstreetmap.org/wiki/Surface>and Smoothness <http://wiki.openstreetmap.org/wiki/Key:smoothness> tags. I really don't know of any renderers that show these tags. I hope the new openstreetmap-carto stylesheet will speed up fixing this problem.
BTW osrm.at is helping in this campaign, because it doesn't route through tracks (although I'm not sure if it takes Surface and Smoothness tags into account). Janko
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