SekeRob
Been there, done that, turned back. There's a lot of 'dangerous track' mapped. Left blank area below the calanchi here, as you read in the change commentary, something bad happened there. There's a tag value 'impossible' with key 'passing' https://taginfo.openstreetmap.org/keys/passing#values but have no idea how the router responds (suspect unsupported). At times I use the OSM route planner to test if tags work or not. There's car, bicycle and foot against which trails can be verified if coding holds. Notably, there's an annual bike race, a copy on youtube and seen Camillo trail signs in the Bucchianico centre some weeks ago, so entirely dead it ain't yet.