Well, it should matter, as there is no right of access to those who are not allowed ( i.e. not co-owners of the road ), so they should not be misled by sat navs taking them through this part of the road... at the same time if they are lead through there it means that OSM because of having incorrect data becomes co-responsible for greater damage to our property due to increased amount of traffic being directed through here... as for the signs, there are signs that inform that this part of the road is an inner road. We should not be put in a situation of having to put obstacles in order to be able to exercise our rights as the owners. Hence we put the signs but now the information should be up to date on map projects like this one.