Earlier quoted context omitted.
That's a bit of a "lost in translation" issue here: what is usually called a "highway" in Europe is usually a "freeway" in the USA. What we'd just call a "road" (pretty much any road) is called a "highway" in the US legal codes.
> what is usually called a "highway" in Europe is usually a "freeway" in the USA. I think that usage is mostly West Coast. :) Everywhere else, I've only heard "highway" or "interstate."
http://www4.uwm.edu/FLL/linguistics/dialect/staticmaps/q_79....
In common usage highway is still sort of reserved for larger connectors, road and street are used for local stuff.