Hello Juanjo,
1) about this way: https://www.openstreetmap.org/way/921469703
it's a contradictory situation here -> there's indeed a traffic sign that cyclists are not allowed to cycle from south to north but at the same time there's the cycle node sign leading to the north towards node 41
2) the third node 16 is indeed located there, I took pictures there (not yet uploaded to mapillary) but you can see it (by far) on this image: https://www.mapillary.com/app/?pKey=207824718254704
Clear answer?
