https://en.wikipedia.org/wiki/Dallas_North_Tollway#History
http://www.thetransportpolitic.com/2012/05/16/a-tollway-in-dallas-and-the-absurdity-of-building-duplicative-infrastructure/
http://www.dmagazine.com/frontburner/2012/06/why-do-plano-ites-prefer-fighting-traffic-gridlock-to-riding-dart-light-rail/