Colombia

A group of cyclists in Los Angeles is hoping to move forward in talks with the city to establish car-free days, based on the ciclovia street closures originated in Colombia.

Bogota, Colombia's bus rapid transit system is seen as a shining example of how buses can make up a good public transportation system in cities. It's also being looked at as a model for fighting climate change.

Traffic is a nightmare in Cali, Colombia, the Latin American country's third-largest city. But a massive redesign is taking place, with German transit efficiency guiding the way.

Globalization has spurned a renaissance in the formerly crime-ridden Colombian city of Medellin. But some worry that the city's improvements may only be temporary.