There's been lots of discussion of "why do we even have the gates, if anyone can get in anyway?" Other than the obvious purpose of being a deterrent to potential bad guys, I believe the gates are good traffic regulators. For instance, it would be almost impossible to cross some of these busy streets, in a golf cart, without the gates to stop the flow of cars. They allow the safe weaving/merging of carts and cars at the gates.
I'm sure there are lots of other reasons too...
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