noun
loop line; belt line
Refers to a railway or road line that forms a closed loop, often circling a city center. Common in urban transit contexts.
東京の山手線は環状線の一つです。
Tokyo's Yamanote Line is one example of a loop line.
環状線が完成すれば、市内の移動が
Once the loop line is completed, getting around the city will be much more convenient.