The excepciona law the requirement of the consent for the cession of data of the census only when it is necessary for l’exercici of the competences attributed to l’administració and only for those matters in which the data corresponding to the name and address are relevant. The tributary general law authorizes the cession of data to the collection of non tributary public resources. L’ús of the interconnection of data bases cannot be generalized in the procedure of sanctionative procedures on the subject of traffic.