I honestly thought it couldn't get much bigger than that. Then Don happens to see this data point:
The North Dakota Department of Transportation is aggressively addressing infrastructure improvements to enhance safety and traffic movement in western North Dakota. The NDDOT invested approximately $940 million in state projects from 2008-2012 to preserve and improve transportation infrastructure in this area. The state is investing an additional $1.16 billion in the 2013-2015 biennium, as well as continuing to plan and work on future road projects.The link will be added to my "Data Links" page.