I've been thinking about this for awhile and I think the problem is roads. People will go wherever the roads are good. They will build houses everywhere and sub

I've been thinking about this for awhile and I think the problem is roads. People will go wherever the roads are good. They will build houses everywhere and subdivide everything a million times. However, if there is no way to access a certain area or it is very difficult, they will not go there and build.