1Coming and going; visiting each other — the act of moving back and forth or maintaining contact between places/people.
東京と実家の行き来が増えて忙しい。
Going back and forth between Tokyo and my parents' home has increased and I'm busy.
彼らはお互いの家を行き来している仲だ。
They visit each other's homes frequently.
メールで行き来する情報を整理した。
I organized the information exchanged by email.
2Street traffic; the flow of people and vehicles on roads or highways.
その通りは昼間の行き来が激しい。
That street is busy with traffic during the day.
山道は行き来が少ないので静かだ。
There is little traffic on the mountain path, so it's quiet.