Hello Albert, as nobody has yet replied, I'm trying. Generally, you can have multiple routes on the same ways by using relations (type=route), see the wiki for more information if needed. Ref tags on ways can be used as long as there is just one route on the segment, but they fail otherwise.
Still generally, you can add ref tags for routes, IMHO regardless of them being signed or not, as long as you can verifiably demonstrate that the route exists even on those unsigned parts (e.g. official documents that are publicly accessible). There might also be gaps in a route, it is not a given that every route will be uninterrupted, so you'd have to find out whether the route on those unsigned parts "is there" but not signed, or is interrupted (hence would not be tagged). AFAIK, routing software never "relies" on relations, relations are there to get the possibility to reuse existing geometry without duplicating it, they provide you with another object, so you can e.g. add several routes on the same highway, while maintaining a logical structure (one relation object per route or direction of a route). Whether you'd add the unsigned parts on the relation depends on the outcome of your research about the route being interrupted or not (see above), but you are of course right that you'd either need an additional relation (part) for the unsigned parts or loose the information that the route is not signed there. My preference would be to add it to the same relation and loose the "unsigned" information. personally, I don't think "unsigned_ref" is a good tag, as it still refers to a "ref", so I would put a "ref" tag and if you want another tag that says the ref is not signed (e.g. ref=PA 235 unsigned_ref=yes, but admittedly, according to taginfo this is not how it is done), but it might be discutable and if you'd really want to emphasize that there are no signs, it would seem a good way to do it. Cheers, Martin
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