When President Donald Trump called for a $1.5 trillion infrastructure investment in his State of the Union address, he didn’t pledge that the federal government actually would provide that much money for roads, bridges, rail and waterways. The federal government typically provides 80 percent of the funding for capital expenditures on highways, with state and local governments coming up with the rest. On transit projects, the federal share typically ranges from 50 percent to 80 percent, according to the American Association of State Highway and Transportation Officials.
http://www.stamfordadvocate.com/news/politics/article/Trump-infrastructure-plan-seeks-to-shift-burden-12541317.php