The urban transportation sector's environmental, economic, and social footprint is immense and expanding. Many of the world's most vexing and pressing problems - fossil fuel dependency, global warming, poverty, and social exclusion - are inextricably tied to the transportation sector. Much of...

Cities around the world face enormous problems of transport sustainability. Rapidly increasing populations and vehicle usage have created gridlock and sprawl, even in very poor cities, as well as unacceptably high levels of air pollution, noise, and accident rates. But improvements can be made....