Hundreds of riders came out to Critical Mass Berlin. Critical Mass is a bicycling event held all over the world on the last Friday of every month. Critical Mass has been described as "political-protest rides for cyclist to reclaim the streets", and characterized as being part of a social movement. Participants have insisted that these events should be viewed as celebrations and spontaneous gatherings.
Get involved in your local Critical Mass ride, and if there is none in your area then start one!