People ride bicycles on a bicycle path in Copenhagen, capital of Denmark, on November 23, 2009. Copenhagen is known as one of the most bicycle-friendly cities in the world. 36% of all citizens commute to work or school by bicycle. Also, the city's bicycle paths are extensive and well used. The local government has also taken some measures to promote the energy-efficient, economical and enjoyable means of transportation. [Xinhua]

A woman rides her bicycle on a bicycle path in Copenhagen, capital of Denmark, on November 23, 2009. [Xinhua]