Implementation The Federal Department of the Environment, Transport, Energy and Communications (DETEC) is striving to achieve sustainable mobility. This requires a coordinated spatial development and transport policy. The individual transport organisations are to be deployed to implement the envisaged development according to their comparative advantages and are meaningfully linked together. The realisation of these goals requires both the expert knowledge of the individual transport offices and a cross disciplinary office which handles the overall transport aspect and the coordination function as well as contributing its expertise in the field of spatial development. The Federal Office for Spatial Development (ARE) has been tasked with performing the functions of the cross disciplinary office.