The invention relates to a suspension bridge type self-supporting aerial metal structure, in which the main platform is designed having three levels. The upper level is intended for the passage of motor vehicles. The intermediate level is intended for the transportation, transmission and distribution of all existing public services, and other possible services. The lower level is intended for an urban public transport system. Thanks to its self-supported aerial design, the structure of the present invention can be built within cities following the same layout as existing roads.