Paris: Vélo Liberté

Paris’ ambitious public-private Vélib’ bike initiative encourages residents to forgo cars for bikes and public transportation. In the process, the program has fostered a unique popular culture, complete with its own language, jokes and pick-up lines. If imitation is the sincerest form of flattery, Paris Mayor Bertrand Delanoe has undoubtedly taken heart: Its success has inspired cities like Rome, San Francisco and London to begin adopting similar programs of their own.