And many suburbs are deliberately designed with tree-like roads, maximizing cul-de-sacs, and minimizing the probability of rat-running and other through-traffic.
Of course, without shortcuts and bike lanes, the same road pattern destroys walkability, because such road networks involve a trip to and from the trunk to get anywhere.
Then you have the gated communities of southern Florida, which are much worse.
Actually, China has gates, fences around everything, there is no such thing as an "open" campus or open apartment complex (unless it is very very urban). It is annoying to the say the least (especially when the gate you want to use is locked).
Of course, without shortcuts and bike lanes, the same road pattern destroys walkability, because such road networks involve a trip to and from the trunk to get anywhere.