Impacts of Policy-Induced Freight Modal Shifts (2019) / Chapter Skim
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Pages 80-86
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80 This chapter describes the mathematical formulations used to specify the freight mode choice models estimated as part of this research. The discussion starts with the shipment-size models, followed by the market-share and the shipment-level models.
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Model Formulations 81 Overview of Model Results Three different types of models were estimated as part of this research: (1) Shipment-size models.
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82 Impacts of Policy-Induced Freight Modal Shifts The freight mode choice models (both aggregate and disaggregate) are grouped into two categories: (1)
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Model Formulations 83 models, in place of the real shipment sizes. The models expressed shipment size as a function of the GCD between shipment origin and destination in miles, which is reported in the CFS for each shipment.
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84 Impacts of Policy-Induced Freight Modal Shifts For models that use generalized cost: As shown in Equation (16)
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Model Formulations 85 must take into account the econometric interactions between the continuous choice of shipment size and the discrete choice of freight (or vehicle) mode.
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86 Impacts of Policy-Induced Freight Modal Shifts For models that use transit time and freight rates separately: For models that use generalized cost: where Tt = Transit time (in hours) by truck, Tr = Transit time (in hours)
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