People ride bicycles in the city of Sao Paulo, capital of Brazil, on Sept. 22, 2014, the World Car Free Day. (Xinhua/Werther Santana/Agencia Estado)

The Mayor of Sao Paulo Fernando Haddad (FRONT) rides a bicycle on the way from his home to his office in the city of Sao Paulo, capital of Brazil, on Sept. 22, 2014, the World Car Free Day. (Xinhua/Werther Santana/Agencia Estado)