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Oxford Circus, in London's West End shopping district, accommodates 43,000 people and 2,000 vehicles every hour. But not very well. It's chaotic, crowded, and dangerous. Here's an animation explaining the problems and solutions

Trace the past and future expansion of the world's biggest cities with the BBCs interactive map (urbanisation and urban growth) The world in 2050: leading experts give their forecasts for the urban future Making cities work: Detroit, Mexico City, Moscow and China Rural to urban migrants speak out.