Figure 6

Illustrating the role of transport in building integration and reducing segregation. As observed in Fig. 5(b), the removal of the transport layer modifies significantly a city segregation and integration. (a) Segregation always increases after removing the transport layer. (b) Integration drops after removing the transport layer for some cities (that may reach values as smaller as the half of the initial value) but remains similar or even raises for other. (c) The raise in segregation grows linearly with the fraction of total flow represented by in the transport layer. (d) The relative change in integration \((GCE_{removed} - GCE_{full})/ GCE_{full}\) is not simply linked to the length of the connections cut: while for seven cities it seems to follow a trend similar to that pointed out in Fig. 5(c), for three cities where the average connection length of the transport layer is very large strongly deviate from this trend