I was just wondering if the idea of an “American Autobahn” had even been explored. It seems like it would be a pretty good idea to put them between major urban centers, such as NY to Boston and such. Is the risk of accidents just too great? Is it cost prohibitive? It seems a bit late to do it now, with all the national infrastructure in place and all, but was the idea ever explored? If so what was the reasoning used against it?