Another victim of non-homogenous planning, São Paulo was developed piecemeal over the course of the 20th century, transitioning from a small, concentrated, urban environment into a sprawling, 3,000sqmi metropolis, with the rich living in the center and the poor pushed to the periphery. That's nothing new with city development, but to alleviate the congestion from resultant commuters, São Paulo replaced one of its most lively neighborhoods with the Minhocão: a two-mile, elevated, noisy eyesore of a highway that winds its way directly through the heart of the city, passing painfully close to many residents' living quarters.
The city's moneyed contingent, however, opted to avoid the congestion issue in the most affluent way possible -- commuting via helicopter. As a result, São Paulo actually has the world's largest fleet of helicopters per capita. Like Doc Brown, where they're going, they don't need roads.