As occurs in many other elements in the park, the viaducts and porticos are constructed bases on prefabricated elements decorated with stone originating from the same site.Despite working with prefabricated columns, capitals, arches and vaults, Gaudí avoided using the same constructive structures for different spacial and functional circumstances. Instead, the architect thought up a different configuration for each one of the four viaducts and porticos of the network of routes in the park.