In the early 20th century roads and highways maintenance and construction regulations were established. Rivers were cleaned, dragged and channeled and the navigational industry was organized. The Public works districts were created, as well as the Ferrocarriles Nacionales de Colombia (National Railways of Colombia). Among other major projects developed were the aqueduct of Bogotá, La Regadera Dam and the Vitelma Water Treatment Plant. The Ministry also created the National Institute of Transit (from the Spanish "Instituto Nacional de Tránsito"), (INTRA) under the Transport and tariffs Directorate and was in charge of designing the first National roads plan with the support of many foreign multinational construction companies.