Curitiba became very famous because it’s grate urban planning and transportation system. Nowdays, the city is world reference model of urban planning and transportation system.
For more information and learning about it you can read the article “Curitiba’s Bus System is Model for Rapid Transport” published in the magazine “Race, Poverty & The Enviroment” written by Joseph Goodman, Melissa Laube and Judith Schwenk. You can also watch a video made by the Curitiba Cityhall and the trailer of the documentary “A Convenient Truth: Urban solutions from Curitiba, Brazil”.
Also, check out the tour “Curitiba like locals: Urban Planing”, a private tour where you can get the chance to see how locals use the great Curitibas’s public transportation system and also get more information about how Curitiba developed it in the last decades. Well recomended!