I agree that borders would be as solid as people could make them for a central secure area, but people could not stay in those areas all the time. They simply could not create borders large enough to enclose an area that would feed them. In many situations you end up with a mid-evil castle or western territory fort type situation IMO.
That was always my problem with the Road Warrior. Where is their food coming from?
If areas are producing surplus agriculture you could end up with a highly fortified section like found in the movie. Where those around the area trade food for "Juice", but your first interaction would probably be with someone in the farms surrounding any central secured point.
I should add the caveat that my thoughts are for a group of 5 year survivors. Over 150 years it would be possible to cover a significant border with protection, but then it still would be very difficult to have the manpower to patrol it all.
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