Flow maps show the movement of objects from one location to another. They can be used to show the movement of almost anything: migration of people, imports and exports, and weather. These maps indicate what it is that moves, the direction the flow is moving, and where its destination is. They also can provide information about how much is being flowed or transported. Lines or arrows can be used to denote all of this information. This flow map represents the total combined truck flows from Texas through the rest of North America in 1998. The red lines are used to signify the movement of trucks departing from all areas of Texas.
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