This part of the Via Mulino until the place where it is joined by the Via Ferrovia (I'll place another comment to mark that spot) should be marked access=private and foot=yes.
Vehicles and bicycles cannot enter here unless they're residents. Note that although the traffic shields seem to indicate that one-way access is possible, because the ‘senso vietato’ shields imply there is a ‘senso unico frontale’ on the other end, this isn't the case. ’Divieto di transito’ signs should have been used instead.