The opening or commencement of operation of a new road, railway, communication line, etc.; when services begin.
新しいトンネルが開通して、通勤時間が短くなった。
A new tunnel opened and my commute time shortened.
高速道路の開通は地域の物流を活性化させるだろう。
The opening of the expressway will likely stimulate local logistics.
来月、地下鉄の新線が開通する予定です。
A new subway line is scheduled to open next month.
The reopening or resumption of services or passage that had been suspended (e.g., a road reopening to traffic, restoration of communication).
事故で通行止めだった区間が先ほど開通しました。
The section that had been closed due to an accident just reopened.
台風で停止していた回線が午後に開通した。
The line that was down due to the typhoon was restored in the afternoon.