Interesting idea, barricading a neighborhood.
The idea came to me after our last hurricane, when the police did not respond in a timely maner. We had shady people coming through my 'hood looking for items to steal. My thought was to block off certain streets so as to make ingress/egress a hassle. With only a few choke points it would be easier to see who comes and goes. Of course it would require buy-in from most of my neighbors, but after the first few rapes/murders they should get on board.