Usually held on the last Friday of every month in over 300 cities in the world, Critical Mass is a protest to the every-day use of street-clogging, pollution-emitting automobiles in cities. During this event the hierarchical roles between a car and a bike are reversed, and with power in numbers, masses of bikes take over the streets.

During November 2007, I backpacked through 6 countries in Europe. Budapest, Hungary was my first stop.