Critical Mass: Manhattan

Meet at Union Square North Plaza, Broadway at 17th St (times-up.org). Subway: L, N, Q, R, 4, 5 ,6 to 14th St–Union Sq. If you harbor fantasies of clean air and car-free streets, hop on your fixed-gear and cruise for a cause with these like-minded souls. (Just don't forget to bring your safety lights and bell.)