Urban and social structure

The suitable definition of and relationship between areas of centrality, the metropolitan road system and the green structure enable the structuring of the urban territory and green fabrics and areas within the metropolis and between the metropolis and the territories of the rest of the region.

Urban and social structure
The urban and social structure is presented as the sum of three layers:

First, the urban structure defines local and metropolitan areas of centrality, which are points or areas that generate and attract flows of people due to their cultural interest or their concentration of professional, leisure and consumer activities or services and facilities.

Second, these nodes are linked by a system of metropolitan roads that shape the urban territory, structuring its fabrics, defining the public space and enabling movement and social relations.

Finally, a green structure, formed by a system of green areas and connections (often superimposed over the metropolitan roads) between urban centres and between them and natural areas. This provides people with access to the ecosystem services provided by the elements in the biophysical matrix and also promotes conservation efforts.


There is a distinction between local centres, organised based on a polynuclear structure that covers the whole territory, and metropolitan centres, which when added to the former create an even richer and more complex polycentric distribution. Taken together they improve public perception of the metropolis as a whole. The existing areas of centrality are related to each other and are directly linked to structural metropolitan facilities and to public transport stations, and the new metropolitan centres to be developed should follow this example.


The purpose of this system of roads, along with elements of the green structure, is to bring people to the centres of the metropolis, to parks and open spaces, and to the major public transport nodes. Generally, the road system, which was developed based on private motorised mobility, has divorced territorial uses and activities from the streets, occupied the public space and created barriers to sustainable mobility. To reverse these trends and achieve a cohesive metropolitan city, the proposal is a system of metropolitan roads that supports sustainable mobility, guarantees the public space and structures the urban fabrics. These roads are: metropolitan avenues, metropolitan streets, metropolitan connectors and metropolitan paths. The order and priority of these roads is classified according to the intensity of people (not vehicles) they are to sustain.


Formed by parks and structural green corridors, its mission is to provide the necessary links between urban settlements and their surroundings in order to produce more habitable urban spaces that introduce nature into the city, lend environmental quality to marginal or vulnerable areas and contribute continuity to urban green spaces. It will be one of the main vectors of metropolitan active mobility, reconnecting areas of centrality, facilities and public transport stations.


Aims presented in the PDU Preliminary Document with respect to the urban and social structure.