FIGURE 1. Interconnected networks of human mobility in North America.

From the following article:

Complex networks: The fragility of interdependency

Alessandro Vespignani

Nature 464, 984-985(15 April 2010)

doi:10.1038/464984a

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The blue network represents short-range commuting flows by car, train and other means of transportation and transport infrastructures. Yellow-to-red lines denote airline flows for a few selected cities; red corresponds to greater traffic intensity. Population density is identified on the grey/white colour scale, with white corresponding to areas of higher density. All features in this map were obtained from real data10.

B. GONÇALVES ET AL., INDIANA UNIV.

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