Class that defines the characteristics of the road infrastructure according to administrative criteria. The class is defined by two fundamental spatial properties, one area corresponding to the aggregate of road areas, and the other linear, corresponding to the aggregate of road elements at the detail level and the aggregate of road sections at the summary level , which symbolically represents the development of the layout of an extended date. The route of an administrative extension has orientation characteristics, in fact, "kilometre markers" are generally distributed along its layout which globally represent the reference system: each marker, placed in a precise position on the territory, shows the value of the kilometer (that is, the progressive line of that road with respect to the beginning of the same) at that point. An Administrative Extension therefore has a starting point and an ending point, but its route can present more than one discontinuity or for situations contemplated by legislative provisions (for example a provincial road in conjunction with the crossing of urban centers with a higher population to 10,000 inhabitants it is "downgraded", for the crossing portion, to a Municipal Road and loses its characteristics of a provincial road) or due to interaction with the rest of the road network: for example, a given provincial road flows into another road (you want state, provincial or municipal road) and resumes its route in conjunction with a crossroads other than the one at the confluence. It is characterized by the administrative classification and by the corresponding property which determines the identification details (code and name of the road, for example SS36 - Strada del Sempione). It is also characterized by the functional classification of the project. From the point of view of management, conversely, some roads can be managed in whole or in portions by subjects other than the owner body (for example, the management of the regional road SR01 may have been delegated to the provinces it crosses).
