I am wondering why OSM shows country based road codes but not International E-road network codes.
More info about E-road https://en.wikipedia.org/wiki/International_E-road_network
asked 16 Feb, 19:21
If you are referring to the "standard" map style, the answer is likely simply "because it doesn't" (show international refs/route membership). The style file for the standard style is already very complex and the rendering output borderline overloaded, so the maintainers need to choose what to display and limit themselves.
Naturally nothing is stopping you from creating your own variant of the style (or a completely different design) that shows the E-references.
answered 16 Feb, 23:50
At least in my neighborhood, the international number is shown: http://osm.org/go/0EpMwJ7i8--?m= But in Belgium, we do not see national numbers on highways when there is an international number. We have mapped e.g. ref=int_ref =E19 and nat_ref=A1 (see http://www.openstreetmap.org/way/10263815#map=18/51.08661/4.44289)
In other countries, the international number is not shown on the destination signs, so there it makes more sense to show the national number on a map.
answered 17 Feb, 08:12