On the first Tuesday of every month, hundreds of “Ciclistas Furiosos,” or enraged bicyclists, take to the streets of Santiago, Chile. Riding as slowly as possible, waving flags, and blowing whistles, they tangle up traffic to protest the city’s dirty air, caused in large part by cars. The group, which began seven years ago and now boasts 5,000 members, emulates similar movements in the U.S. and Europe and aims to get people out of their cars. The cyclists are hopeful that Chile’s new Socialist president, Roberto Lagos, will be more receptive to their calls for bike paths and car-free days than the previous administration of Eduardo Frei.