Household Mobility Tool Ownership: Modeling Interactions between Cars and Season Tickets |
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Authors: | Darren M Scott Kay W Axhausen |
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Institution: | (1) Center for Spatial Analysis, School of Geography and Earth Sciences, McMaster University, 1280 Main St. West, Hamilton, Ontario, L8S 4K1, Canada;(2) Institute for Transport Planning and Systems (IVT), ETH Zurich, CH-8093 Zurich, Switzerland |
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Abstract: | This paper moves beyond traditional models of car ownership in that we propose a framework for modeling household-level decisions
to acquire specific types and numbers of mobility tools to fulfill the mobility needs of household members. The framework
is applied to a data set collected during the winter and spring of 2000/2001 in the German city Karlsruhe via an interactive
web-based stated response survey in which respondents could optimize their household mobility tool sets through on-line feedback
concerning the estimated costs of the sets. In our analysis, bivariate ordered probit models are estimated for three combinations
of mobility tools: season tickets (i.e., transit passes) and cars, season tickets and small cars and season tickets and large
cars. In all instances, strong substitution effects are found – that is, as the number of season tickets increases, the number
of cars decreases. This finding underscores the need to move beyond simple models of car ownership to comprehensive models
of mobility tool ownership. As demonstrated by our research, failure to do so is likely to lead to biased results. |
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Keywords: | bivariate ordered probit model car ownership mobility tool season ticket ownership stated response survey transit |
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