Ciclovia

Once a week, car-flooded streets convert into bike- and pedestrian-flooded public parks in crowded Mexico City.

Temporary street closures for pedestrian use -- an idea that spawned in Bogota, Colombia -- are occurring in cities all over the world. The trend is expected to continue.

San Francisco Mayor Gavin Newsom is considering a plan to temporarily close down certain streets to car traffic, creating public space for pedestrians -- similar to the successful Ciclovia that takes place weekly in Bogota, Colombia.