A few comments from our experience here in the south of the province of Luxembourg.
Users jfonda, juminet, some others and myself have been very busy creating relationships for the waymarked paths in different municipalities. The work is not easy because there is always a lack of details to properly tag the route and it is very difficult to get to the end! Some of them are not maintained. Names and local references may differ depending on the source. Some GPX files are not available. The signs are not well defined. It is not specified if the trail is one-way. Etc. You may be aware that the CGT (Commissariat Général au Tourisme pour la Wallonie) has a list of about 2900 'official' marked trails. In view of this, it seems unrealistic to me to start with 'virtual' routes when we have not yet mapped the 'waymarked' paths. Moreover, there is still a lot of work to be done with the tags linked to the characteristics of the highways (surface, grade, incline, etc.). I also think that with the increasingly developed routers, in the future, we will be able to define our routes by ourselves without having to refer to 'waymarked paths'. Pierre aka foxandpotatoes
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