Bicicletada Sao Paulo!

Critical Mass in Sao Paulo. For those who have never heard of Critical
Mass. It is an event that started in San Fransisco and spread to
cities around the world. Last Friday of every month, cyclists get
together and take over the streets without any route in particular.
The idea is the promote cycling and remind motorized vehicle drivers
that the roads are for bikes too. Look it up on wikipedia for more
info!