São Paulo has more car than population, and has so many cars that their area summed is bigger than the area of all streets in the city.
It is so many cars that sometimes walking 1 hour to your workplace is faster than a car route where you can spend 2, 3 hours to go to a neighborhood next to yours during rush hour.
So many cars that the city became also the city with most helicopters, because as ludicrously expensive they are, for people that need to reach their workplace really fast (CEO, firemen, medics...) helicopters are good idea.
Situation got so bad that the government wants to heavily restrict the use of helicopters because private helicopters were causing literally airborne traffic jams along the normal traffic jam, blocking public services like police from moving to emergency sites.
EDIT: indeed I was talking about adults, forgot to make it clear. Still the percentage of cars to people in Brazil tends to be high. It is one of the reasons car companies love Brazil. There are historical reasons for that. Mostly politics related.