Characteristics of Premium Transit Services that Affect Choice of Mode (2014) / Chapter Skim
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Pages 22-30
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22 Path-building is a process to identify the access, route, transfers, and egress elements of a transit trip. Parameters are used to weight the importance of each element.
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Implementation in Travel Models 23 Together, these two changes result in a model that generates results approximately equivalent to the original model while reducing the negative consequences of a hierarchical transit service mode structure with large mode-specific constants. Figure 7 presents the mode structure for the original model (left)
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24 Characteristics of Premium Transit Services that Affect Choice of Mode for commute trips for both bus and train. The premium transit attribute values from the Salt Lake City survey were not used because the later surveys had better information from a methodological standpoint.
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Implementation in Travel Models 25 parameters. The best match was selected by examining expected interpretations of path-building parameters.
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26 Characteristics of Premium Transit Services that Affect Choice of Mode show the origin location of surveyed trips and suggest that the more limited coverage area of the transit path choice model is still more extensive than observed usage patterns. The blue ovals show two premium service market areas that capture the majority of the travelers destined for the University of Utah.
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Implementation in Travel Models 27 Table 7. Comparison of existing and path choice model alternative specific constants and boarding penalties in minutes (walk access)
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28 Characteristics of Premium Transit Services that Affect Choice of Mode – Direct walk time, which represents additional time to access premium modes directly and ranges from 5 minutes to 10 minutes for direct access to express bus, BRT, LRT, and commuter rail modes for the existing model. This parameter is zero in the transit path choice model.
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Implementation in Travel Models 29 The final test of the path-based model concerns its results. As shown in Table 9, the pathbased model generates results that are very similar to the existing model despite the fact that it does not rely on service mode-specific paths and reduces the magnitude of many of the ASCs.
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30 Characteristics of Premium Transit Services that Affect Choice of Mode Lessons Learned Some lessons were learned when accounting for non-traditional transit service attributes in mode choice: • Enumerating path choices based on observed behavior provides improved accuracy of the path-building parameters in the model and the choices provided for each access mode. • Revising mode choice model nesting structures to include several path choices for each access mode (walk and drive)
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