Transportation services provided for public use (e.g. trains, buses, subways); public transport used for commuting and general travel.
明日は公共交通機関を使って会社に行きます。
Tomorrow I'll go to the office using public transportation.
大雪で公共交通機関が止まり、通勤に大きな影響が出た。
Heavy snow halted public transportation, causing major disruption to commuting.
その町は公共交通機関が充実しているので車がなくても便利だ。
The town has good public transportation, so it's convenient even without a car.