public transportation
US /ˌpʌb.lɪk træn.spɚˈteɪ.ʃən/
UK /ˌpʌb.lɪk træn.spɚˈteɪ.ʃən/

1.
a system of buses, trains, etc., that is used by the public
:
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I usually take public transportation to work.
•
The city is investing more in public transportation infrastructure.