noun
national road; national highway
Refers to a road designated and managed at the national level; often appears in route names such as 国道一号 or in phrases like 国道沿い.
国道沿いに大きな道の駅がある。
There is a large roadside station along the national highway.
国道一号を走って東京へ向
We headed for Tokyo on National Route 1.