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This video demonstrates the concept of "probe vehicles" in TransVis, the software randomly selects a certain percentage of vehicles to display in "large" size so that you can get a quick aerial idea of which paths are quick and which are not. This video also demonstrates how congestion develops over time by utilizing a "heat plot" which becomes hotter as more vehicles accumulate in a given area and cooler as they dissipate. The effect of both together demonstrates why certain probe vehicles slow down while others do not.
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