> In Mexico City, the city has simply licensed dollar vans with just the minimal oversight necessary for public safety. They've all painted themselves green and white and the informal routes have firmed up but there is still -- decades later -- no map, public or private, of the routes of the most common form of transit in this modern city of 22 million.

http://www.viadf.com.mx/directorio/Microbus looks like a good directory of microbus routes.