Indeed, I can create this extra thread (I’ll do it when I have some more time - tonight or in coming days).
I think that we need to be very careful with this. As your discussion with @rainerU indicated, we cannot trust the GPX tracks received from NECCs to reflect perfectly the current reality on the ground. In France, indeed, Vélo & Territoires receives updates yearly from local authorities, and then sends all updated sections to us. In other countries, some NECCs don’t have this kind of system and data can be more outdated. In countries with no NECC, the GPX tracks have in some cases not been updated for years, as we didn’t have someone sending us updates. That’s why Knooppuntnet is such a good tool, to identify these issues…
And of course, routes with nothing on the ground should probably not be mapped at all, as we are discussing here. But NECCs are officially responsible for EuroVelo routes in their countries, and deciding where they go. They can decide to modify an itinerary or delete one. If this happens, and there are no signs on the ground, I think that OSM data needs to follow. That’s where the management question is more important.
I’ll think a bit about it and we’ll discuss it more in the new thread 