Importance of Field Location to the Nature of Data

In summary, there are two important points to keep in mind with respect to field observations collected for the development of traffic stream models. First, the location limits the range of flow, speed, and density values. The second important point is that the data sets used may influence the results and the comparison between models.

Image of a directional roadway, with areas A, B, C, and D.  Theoretical speed-flow, flow-density, and speed-density curves are also shown directly below the four measurement stations.

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