Main link is just to a tiny NYT article. The real meat is in the scientific paper I've included in extended. It's an entire overview of sprawl in the U.S. over the last 100 years through the lens of road connectivity. Sounds kind of boring but it's cool as hell. Don't be scared off by the technical writing--it's composed so that people outside the field can understand it and has a lot of cool figures. Best PNAS paper of 2015 in my opinion.