Analysing Demand for Suburban Trips: A Mixed RP/SP Model
with Latent Variables and Interaction Effects |
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Authors: | Raquel Espino Concepción Román Juan Dios De Ortúzar |
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Institution: | 1. Department of Applied Economic Analysis, Edificio Departamental de CC. EE. y EE., Universidad de Las Palmas de Gran Canaria, Bloque D, Campus de Tafira, 35017, Las Palmas de Gran Canaria, Espa?a 2. Department of Transport Engineering, Pontificia Universidad Católica de Chile, Casilla 306, Código 105, Santiago 22, Chile
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Abstract: | We analyse mode choice behaviour for suburban trips in the Grand Canary island using mixed revealed preference (RP)/stated
preference (SP) information. The SP choice experiment allowed for interactions among the main policy variables: travel cost,
travel time and frequency, and also to test the influence of latent variables such as comfort. It also led to discuss additional
requirements on the size and sign of the estimated model parameters, to assess model quality when interactions are present.
The RP survey produced data on actual trip behaviour and was used to adapt the SP choice experiment. During the specification
searches we detected the presence of income effect and were able to derive willingness-to-pay measures, such as the subjective
value of time, which varied among individuals. We also studied the systematic heterogeneity in individual tastes through the
specification of models allowing for interactions between level-of-service and socio-economic variables. We concluded examining
the sensitivity of travellers’ behaviour to various policy scenarios. In particular, it seems that contrary to political opinion,
in a crowded island policies penalising the use of the private car seem to have a far greater impact in terms of bus patronage
than policies implying direct improvements to the public transport service. |
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Keywords: | discrete choice models interaction effects latent variable revealed preference stated preference willingness-to-pay |
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