interstate
This term carries a strong association with the American landscape, specifically evoking images of vast distances, asphalt ribbons, and the efficiency of long-haul travel. It suggests a scale of movement that transcends local or regional boundaries, implying a connection between disparate geographic hubs. While it can technically describe any relation between states, it is almost exclusively used in a transport context. It differs from a local road or a city street by its lack of stoplights and its primary purpose of facilitating rapid, uninterrupted transit across a continent.
Countable when referring to a specific highway route (Interstate 95). Uncountable when describing the general nature of trade or travel between states (interstate commerce).