"A lot of the data we wanted to have access to to do the analysis researchers have been talking about didn’t exist," says Aileen Carrigan, a senior associate at EMBARQ, the World Resource Institute’s center for sustainable transport.

"A lot of the data we wanted to have access to to do the analysis researchers have been talking about didn’t exist," says Aileen Carrigan, a senior associate at EMBARQ, the World Resource Institute’s center for sustainable transport.

Curitiba, Brazil is known for being the birthplace of BRT. Photo by Robert Blackie.

Curitiba, Brazil is known for being the birthplace of BRT. Photo by Robert Blackie.

Public transit buses, taxis and bikers take over the streets on car-free day. Photo by Carlos Felipe Pardo.

Rio de Janeiro unveiled the first station of its forthcoming bus rapid transit system, which conntects Barra da Tijuca (pictured above) to other city neighborhoods. Photo by Rodrigo Soldon.

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p>With population and urbanization rates growing, and motorization not showing any signs of slowing down, we need a new option for personal mobility. The current size and rigidness of cars leave little room for future urban growth and threaten the health of cities.

Medellin transformed violence and despair into hope and opportunity, using sustainable transport as one of the key levers to drive change, explained Holger Dalkmann. Photo courtesy of Carlos Felipe Pardo.

The Mexican state government of Tamaulipas launched an urban mobility plan for cities across the state, such as Nuevo Laredo. Photo by J. Stephen Conn.

The U.S. DOT's recent round of TIGER transport grants awarded Chicago $20 million to establish a bike share program and make improvements to the Blue Line train. Photo by Russell Sekeet.