The historic centre is clearly recognizable and the morphology of the first urban neighbourhoods built outside the medieval walls can be read clearly as they are compact and well defined. The remains of the metropolitan area an immense sub-urban area, with buildings scattered everywhere and roads dispersed, appears to have no apparent logic. Moving away from the city on the main arteries one starts to come across urban remnants. The urban fabric starts to dissolve and fragments appear sporadically attached to the main highways.