That sure was the implication in Diary of the Dead. As for TWD the simplest explanation would be that most zombies of color are wandering the same areas they used to live (ie urban areas instead of the rural areas there most of the show is set).
Well, that’s just boringly logical.
Yes. My son and I took a Segway tour of Atlanta last year, and our guide showed us the highway overpass with this vista: http://undeadwalking.com/files/2015/01/the-walking-dead-season-11.jpg
