Hourly traffic on the United States Interstate, visualized as a living circulatory system

Highway networks are often compared to the human circulatory system, an analogy that works on many levels. The hierarchical structure of highways, streets, and local roads matches that of our body’s arteries, arterioles, veins, venules, and capillaries. And like the circulatory system, highways serve as the infrastructure by which resources are distributed to where they are needed, keeping the system healthy and helping it to grow.

Max Galka via metrocosm.com

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