https://en.wikipedia.org/wiki/Interstate_Highway_System https://en.wikipedia.org/wiki/Interstate_Highway_System The interstate highway system got passed in 195

https://en.wikipedia.org/wiki/Interstate_Highway_System https://en.wikipedia.org/wiki/Interstate_Highway_System The interstate highway system got passed in 1956. It is now comprised of almost 50,000 miles of highway, and cost almost $500 Billion in todays dollars. There would have been a whole lot of rebar used in the construction of all the concrete - bridges, overpasses, the concrete sections in Los Angeles and other high volume areas