Well, it causes traffic congestion. You have all these gated communities that dump traffic out onto the main streets. If you have a typical grid setup of streets, traffic can cut through on any number of streets. If you want to travel from a house in one gated community to a house 500 feet away in another gated community, you have to drive all the way out to the entrance, out onto the major clogged street, back in to the entrance of the other gated community and then to the house you want to visit. Grid systems are MUCH more efficient for traffic (And fuel consumtion, but that's another story.)
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