Which preposition to use with unseparated

from Occurrences 2%

That is where the Americans are clever, in the beautiful laying-out of their towns; but then, as I said, they have not old débris to contend with, though I shall always think it looks queer and unfinished to see houses standing just in a mown patch unseparated from the road by any fence.

Which preposition to use with  unseparated