noun
National Highway Act
Formal legal term referring to the Japanese law that governs national expressways. Used in legal, administrative, and news contexts.
高速自動車国道法に基づき、新しい路線が指定された。
A new route was designated under the National Highway Act.
Compound of 高速 (high-speed), 自動車 (automobile), 国道 (national highway), and 法 (law). The exact historical derivation is uncertain; the term is a modern legal designation.