The question of access -where, when, and by whom- is one of the classic issues for the spatial and functional organization of cities and is topologically linked to geographical distance. Planning models that promote proximity aim at an urban form that ensures equity of access to functions and land uses by all, which implies high densities and mixed land uses as well. This is generally opposed to models that promote distinct and differentiated zones that heavily depend on trans-local connectivity, especially cars, to connect areas for daily commuting, like for example the Post-War CIAM agendas, or the US suburbia