Curitiba, Brazil implemented an innovative and sustainable transportation system and urban planning strategies over several decades beginning in the 1960s. Key steps included developing a master plan in 1964 focused on minimizing sprawl, preserving historic areas, and investing in affordable public transit. This involved creating a network of bus routes connected to high-density development. Curitiba also emphasized social and environmental programs around recycling, green spaces, and citizen participation. As a result, Curitiba has been recognized internationally as a model of sustainable urban planning.