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    Map of Catalonia at scale 1:400 000 with the intensity of road traffic in the year 2006, into 10 intervals. The metropolitan zone of Barcelona is represented at scale 1:200 000. Map published in collaboration with the Direcció General de Carreteres, Departament de Política Territorial i Obres Públiques de la Generalitat de Catalunya (Road and Public Works administration of the Government of Catalonia)