Transforming Transportation 2013 hosted policymakers and transport experts. Photo by Aaron Minnick/EMBARQ.

Medellin, Colombia was one of the two winners of the 2012 Sustainable Transport Awards. Photo via ITDP.

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.

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p>The 2012 Sustainable Transport Award will be presented on Tuesday, January 24, 2012, to two cities among four finalists: Buenos Aires, Argentina; Cape Town, South Africa; Medellin, Colombia; and San Francisco, USA.

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.

Guangzhou, China was the winner of the 2011 Sustainable Transport Award. Photo via ITDP.

"Collaboration is key," says Volvo, in tackling the challenges of mobility. Photo by Ram Joshi.

The Guangzhou BRT runs along one of the busiest corridors in the city and carries 800,000 passengers each day. Photo via ITDP.

The Guangzhou BRT runs along one of the busiest corridors in the city and carries 800,000 passengers each day. Photo via ITDP.

Polly Trottenberg was the keynote speaker at last night's Sustainable Transport Award Ceremony. Photo by Aaron Minnick.