I'd have thought 'drivers without local knowledge' would be more likely to be on the look out for signs and to respond to them, while local drivers are more likely to continue using their familiar routes, 'unaware' of the changes and not 'noticing' the signs. As I understand it, 'Access' only allows you to get to properties in the restricted length of road, but that's not so easy if you don't know where the restriction ends, as its only indicated by the blank back of the other sign!
Peter Evans ● 1845d