Validation of Urban Freeway Models (2014) / Chapter Skim
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18 Overview Following this overview section, which describes the metrics used to perform the validation, this chapter presents the validation results for the data-rich and the data-poor models. The complete results are included in Appendix C (Data-Rich Validation)
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19 50th-percentile, and 10th-percentile TTI, resulting in a total of 24 data models to be validated. The independent variables used in each model were described in Chapter 2, and the equations for each model are contained in Appendix C
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20 in bold indicate regions and time periods used in the datarich validation. In the Salt Lake City and Spokane regions, very few of the roadway sections experienced traffic conditions that qualified under the peak period and peak hour definitions established in L03.
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21 From a time period perspective, the highest RMSEs are seen during the peak period, which is defined specifically for each section to cover time periods of at least 75 min, during which the average speeds fall below 45 mph. The RMSEs are lower, though still high, for the peak hour models.
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22 Results Table 3.5 summarizes the root mean square error estimates for each model on all sections (All Data column) and by region.
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