Ha, I always thought it was weird that Atherton didn't have sidewalks but I didn't know it was prohibited by law.

I guess it kind of makes sense in a way, though. The thing about Atherton is the lot sizes are enormous, so even if they did have sidewalks it wouldn't make sense to walk anywhere. It would take forever just to walk three houses down the street and you'd just be walking past a giant wall or hedge with nothing to look at. Sidewalks would be wasted.