OSM is helped by the On The Ground Rule, in other words, physical world is the canonical source. There's quite enough disagreement in secondary tags (e.g. "smoo

OSM is helped by the On The Ground Rule, in other words, physical world is the canonical source. There's quite enough disagreement in secondary tags (e.g. "smoothness" of a way), but having a universal canonical source (whatever is physically there) helps immensely with conflicts between data sources (sometimes from three data sources, you can get five data points, neither of which matches the physical feature ;)). https://wiki.openstreetmap.org/wiki/Disputes#On_the_Ground_Rule https://wiki.openstreetmap.org/wiki/Disputes#On_the_Ground_R...