Atlanta, Georgia had a terrible traffic problem. Simply put, the city's road infrastructure was horribly equipped to deal with the three million or so people who live in or around the city. The city decided to build a new toll road straight through the centre of the city to its northern suburbs. To do this, they had to utilize eminent domain to buy people's property. All told, I think it cost several hundred million dollars, but they built the extension to State Road 400, and suddenly, the several-hour backups that used to occur on 75 and 85 no longer occur, or are significantly shorter. (eestlinc could probably attest to this better than I could, since he actually lives there).