interstate highway
Refers specifically to the US Interstate Highway System. A formal, technical term; in casual conversation, インターステート or simply 高速道路 may be used.
The interstate highways connect major cities in the United States.
General term for expressway or freeway, not limited to the US Interstate system.
Loanword from English 'interstate', often used in casual contexts.
Compound of 州 (state), 間 (between), and 高速道路 (highway). A direct translation of 'interstate highway'.