In this chapter we discuss different visualizations of microscopic and macroscopic cross-sectional data and the possible conclusions that one can draw from them. Time series of aggregated quantities such as speed, flow, and density show temporal developments, while speed-density and flow-density diagrams allow us to make statements about the average driving behavior on the observed road segment. Particularly the flow-density diagram contains so much information about the traffic dynamics that its idealized form is also called fundamental diagram of traffic flow. If single-vehicle data is available, we can also obtain distributions of microscopic quantities (vehicle speeds, time gaps, etc.).
Traffic Flow Road Segment Congested Traffic Traffic Demand Fundamental Diagram
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