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What is Generation (Transport Modelling)

Chapter 2
Handbook of Research on Urban and Humanitarian Logistics
The process of estimating the transport demand at origin (Production) and/or destination (Attraction). It is usually assumed that demand generation models include both production and attraction flows. That stage corresponds to the first of four-step models. In freight transport, generation can be made for number of trips (or deliveries, or shipments), in that case we call this process freight trip generation, or for commodity quantities, in that case we will qualify those models with the term “freight generation.”
Published in Chapter:
Implications of Activity Classification Aggregation in Urban Freight Trip Generation Linear Models
Ivan D. Sanchez-Diaz (Chalmers University of Technology, Sweden) and Jesus Gonzalez-Feliu (Ecole des Mines de Saint-Etienne, France)
Copyright: © 2019 |Pages: 16
DOI: 10.4018/978-1-5225-8160-4.ch002
Abstract
This chapter studies the implication of aggregating establishments by categories with different levels of detail for modeling FTG. To this effect, the chapter conducts an assessment of freight trip generation (FTG) patterns homogeneity inside activity-based grouping. The method implemented is econometric in nature, which allows the assessment of the statistical significance of variables representing commercial activity sectors and sub-sectors. The results show that for some sectors the traditional high-level aggregation includes sub-sectors with homogenous FTG patterns and thus produces appropriate models; in some other cases (e.g., retail, manufacturing), the sub-sectors have different FTG patterns and thus more detailed data is needed to calibrate accurate models. This research can be used to enhance the efficiency of data collection, as it identifies some sub-sectors that need larger efforts for data collection, and some other categories where FTG homogeneity allows for less detailed data collection without hampering the quality of the models.
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