one-way traffic; traffic allowed in only one direction (as indicated on road signs).
この道は一方通行なので反対方向には行けない。
This road is one-way, so you cannot go in the opposite direction.
駐車場の入口は一方通行になっています。
The entrance to the parking lot is one-way.
工事中のため周辺が一方通行に変更された。
Due to construction, the surrounding roads were changed to one-way.
one-sided; only flowing in one direction (e.g., communication or feelings), indicating a lack of mutual exchange.
彼女にとってその告白は一方通行の恋だった。
For her, that confession was an unrequited (one-sided) love.
会議での発言が上司から部下への一方通行になっている。
At the meeting, speaking has become one-way from bosses to subordinates.
ネット上では一方通行の情報も多いので注意が必要だ。
On the internet there is a lot of one-way information, so caution is needed.