Flow maps are maps used to represent the 'flow' or transportation of objects from one place to another. This map of the U.S maps specific flows of goods via trucks to places all through the country, most are in Texas but several arteries branch out in a fan shape that in turn branch into smaller capillaries exporting to other cities.
http://www.lib.utexas.edu/maps/texas/combtrk_tx_1998.jpg
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