As you hear the term Flow you might think of how water may flow to an area depending on the structure it spills on. Well in a flow map what you are seeing is the flow of something, a particular variable you could say. In this map you see what look like veins running all over the US. Well what you are looking at here are the routes of freightliners in the US and where they are throughout the US and the places they go to the most. As you can see where it gets to be more red near the Texas area, this is showing more freight occupying this area in and out.
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