It's not that common in our area but we do have a few gated neighborhoods in Wilmington, NC.
In Leland, Waterford of the Carolinas has each residential street gated with a touchpad for entry. If the homeowner has a house phone, guests can call them from the gate keypad to be buzzed in.
Some gated communities, such as Landfall in Wilmington and Compass Point in Leland, are actually Guard Gated. This means that a security guard is at the main entrance to verify those who want to enter.