Earlier quoted context omitted.
If only local roads existed: Trains would have continued to serve most locations cheaply. The federal highway system did great damage to the far more efferent but far less subsidized train network. Trans take less land, less capital, fewer workers, less fuel, and cause fewer deaths.
I suggest you look into the history of that. Rail lines created massive monopolies that had a stranglehold on American businesses until the creation of highways. Why are goods even transported via trucks if rail is such a viable and cheaper alternative? Are business owners simply dumb?
Multi billion dollar subsides subsidies. Markets are only rational when left alone, toss more than $425 billion dollars just to build something and then maintain it with government funds and efficiency takes a back seat.