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Micahel Bloomberg, mayor of New York City, sits on stage as he participates in a discussion at the keynote session at the annual Transforming Transportation conference in Washington DC, January 18, 2013 (Credit: World Bank/Simone D McCourtie)

Micahel Bloomberg, mayor of New York City, sits on stage as he participates in a discussion at the keynote session at the annual Transforming Transportation conference in Washington DC, January 18, 2013 (Credit: World Bank/Simone D McCourtie)