noun
inner loop; inner track; inner lane
Often used for train or bus routes that circle a city center in the inner direction, or for the inside lane of a track. The 'indoors' gloss is rare and context-dependent.
山手線の内回りに乗ってください。
Please take the inner loop of the Yamanote Line.
陸上競技では、内回りのレーンが有
In track and field, the inner lane is advantageous.