Thank you all for your answers, and for your hints not to map too much detailed.
For my question, the key seems to be: "roads must share a node to let the routing software calculate...". A lot of times I find situations like this one [1]: there are no roads connecting the highway from NW and the highway from SE, but I think routing sw must know the two highways are connectable... So, I'm undestanding that sometimes it could be necessary to draw "virtual" roads around or inside a village, to connect between them several external roads (of course, if it seems appropriate, looking at the aerial images). If so, maybe it could be suitable to put a note (if not a specific tag), indicating that segment as "virtual"? Thank you again, Marco [1] http://www.openstreetmap.org/#map=16/12.0527/14.4386
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