main road; main thoroughfare; arterial road
幹線道路の渋滞が毎朝続く。
Traffic jams on the main road continue every morning.
幹線道路沿いには大型店舗が多い。
There are many large stores along the main road.
新しい幹線道路の建設計画が発表された。
Plans for a new main thoroughfare were announced.