Re: bridges and roads, it's hard to run experiments, and its usually too late once you do: http://minnesota.cbslocal.com/2014/08/01/friday-marks-7-year...

Also: http://www.usatoday.com/story/news/nation/2013/09/15/bridges...

Healthcare is too subject to devolve in political argument for me, someone else has to put up some data on that one.