transportation; transport; transit system
Refers to the overall system, facilities, or means of public and private transportation. Often used in formal, news, and everyday contexts to discuss infrastructure, schedules, and availability.
Transportation was disrupted by the typhoon.
この地域は交通機関が発達している。
This area has a well-developed transportation system.
I use public transportation for my commute.
Transportation services are disrupted because of the typhoon.
Transportation ground to a halt because of the heavy snow.
There's no transportation to the station, so I'll drive there.
交通機関 refers to the actual means of transport (trains, buses, etc.), while 交通網 refers to the overall network or system connecting them.