Passage or passing through (of people or vehicles); traffic flow or the act of passing through a road or passageway.
この道は工事のため当分の間通行できません。
This road is impassable for the time being due to construction.
夜間は車の通行が少ない。
There is little car traffic at night.
歩行者専用のため自転車の通行はご遠慮ください。
Bicycles are not allowed to pass as this is for pedestrians only.
Widespread or common usage; something that is accepted or used generally (a more literary/administrative usage).
その古い表現はもはや通行しなくなった。
That old expression is no longer in common use.
慣習が社会に通行している限り変えるのは難しい。
As long as a custom is accepted in society, it's hard to change.