It started operation in November 2002 at Metro do Porto stations and is now a cross-network ticket used on the Porto Metro, selected bus and train routes and the Funicular dos Guindais cable railway.
DOS | MS-DOS | John Dos Passos | São José dos Campos | Campos dos Goytacazes | Plaza Dos de Mayo | Junior dos Santos | Graciano dos Santos Neves | Dos Pueblos High School | Dos Hermanas | Angra dos Reis | Universidade do Vale do Rio dos Sinos | Un, dos, tres... responda otra vez | José Eduardo dos Santos | Augusto dos Anjos | Ary dos Santos | Sergio Claudio dos Santos | Pau dos Ferros | Nezinho dos Santos | La Unión District, Dos de Mayo | Isabel dos Santos | Funicular de Sant Joan | ESPN Dos | Éder dos Santos | DR-DOS | DOS Protected Mode Services | DOS extender | Dos de Mayo Uprising | Dos de Mayo Province | ¡Dos! |