A lot of modern day roads follow much older roads (which explains why the roads in NJ are so screwed up) so it would make sense that after a nuclear war many of the direct more traveled route roads would last a lot longer than roads less traveled. So even after 150 years some modern routes would still be there just much smaller. Side roads and places like abandoned community's would be just grown over messes barely visible if at all on the sides of those roads.
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