Flow maps are line maps that show direction and possibly intensity of flow of subjects or objects between points. The can be actual paths or "desire lines" depicting the general direction. Flow maps can be used to demonstrate social networks, travel in various forms, or routes for exchange of goods or services. This 1998 flow map shows Texas trucking flows in a network, and state to state.http://www.lib.utexas.edu/maps/texas/combtrk_tx_1998.jpg
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