In 2000, Bogota in Colombia became the first city to restrict the use of private vehicles throughout an entire metropolis for a day.
(The Islands of Sark and Herm (in the Channel Islands) are car free 365 days a year. Herm has even banned bicycles!
I guess it's Shanks' Pony then.)
!Note - Shanks' Pony describes using your feet as a means of transport.
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