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World's most sustainable transport systems

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2006: Seoul

This megacity, home to around 10 million people, was recognized for replacing an elevated highway with an 11km stretch of water, greenery and walkways called Cheonggyecheon. It also added "exclusive bus lanes" along 36 miles of streets.

Authorities have set out a vision for 2030 that the South Korean city becomes a place where "people will not need to rely on their cars."

Plans include increasing sidewalk space for pedestrians and the "provision of a public bicycle service free of charge throughout Seoul."

Ed Jones | AFP | Getty Images