It's a combination of things.
1. traffic control, especially with gates that merge with golf cart traffic
2. customer service - notice the visitor gate is closest to the gatehouse. If a visitor needs directions, the gate attendant is trained to assist them in getting where they're trying to go.
3. a deterrent to trespassers. It's not a preventative. But it does remind people that someone is always watching. If that can scare off even one house-burglar, then they've proven their value.
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