Each used path from centroid 25 to centroid 600 is displayed on the network by color. Dynamic traffic assignment results can be extremely sensitive to route-choice, so it is important to understand how path choice varies over departure interval. Path-based analysis can provide invaluable insight into calibration efforts.
The relative thickness of bars represents demand for the paths. In a dynamic user equilibrium traffic flow is assigned in such a way that the travel times among used paths between each origin-destination pair are equivalent (within each departure interval).
The slope of the triangular flow-density relationship is determined by link free speed and vehicles' effective lengths and response times along a link. The coloured points correspond to measurements across lanes. Congestion is represented by the right side of the triangle. The left side is the free-flowing, uncongested regime. When congestion occurs, as on this link, points appear inside the triangle because the density measures are time-averages of the congested and uncongested regimes that occur during the statistics collection interval.
Scattergram plots show the impact of a demand increase on turning movement counts. Built-in regression statistics offer quick metrics for comparison. Network link and movement attributes are automatically configured on request from traffic assignment results. User-defined attributes can be created on demand. As with all other Dynameq plots, Scattergrams are presented as a time-series to show temporal effects.