noun
outer ring; outer loop
Refers to a ring road or loop line that encircles a city or area; commonly seen in compound names such as 外環状線.
東京外環自動車道は、都心の外側を走る高速道路です。
The Tokyo Outer Ring Expressway is a highway that runs around the outside of the city center.
外環状線が完成すれば、渋滞が緩和されるでしょう。
Once the outer loop line is completed, traffic congestion should ease.