Rings of Mobility
The preponderance of each mode in the spatial imprint of urban transportation as a support to urban mobility is dominantly related to density. The above figure shows three rings of increased density, each characterized by specific mobility considerations:
  • A (Core area). Often related to a CBD representing the optimum level of urban density and centrality. In such a context, the pedestrian space is dominant as most origins and destinations are close by. Sidewalks tend to be substantial and where the conditions are favorable, a system of overpasses and pedestrian-only streets have been established. This area is often the point of convergence of the regional passenger transport system, implying the presence of transit systems and their associated terminal spaces. The handhold of the road space is mainly attributed to a pattern of streets supporting local circulation.
  • B (Central area). Represents areas of medium to high densities, often adjacent to core areas. The walking space has lost some of its importance but still support mobility around major nodes (transit stations) and corridors (commercial streets). Commercial terminals, mainly rail freight yards and old port facilities, are also occupying substantial amounts of space.
  • C (Peripheral / suburban area). Mobility is dominantly provided by road transportation with walking and cycling servicing residual functions, often leisure-oriented. Space consuming terminal activities, such as airport and modern - containerized- port facilities occupy significant amounts of land.