The Reliability as a Choice Variable: Experiments with different Measurement Approaches (SVI 2000/391)
Overview
Background & policy context:
The daily work of demand modelling is focussed on travel time and trip costs. In fact, they are the decisive criteria for the evaluation of traffic infrastructure projects like the upgrading of roads or networks as well as for the planning of public transport services. Especially in terms of schedule construction this focus on shorter travel times ignores the fact, that even small incidents or longer passenger change times at high traffic volumes can lead to very unreliable service and decreasing punctuality rates.
Objectives:
This study shows the strong influence of system reliability on the choice behaviour. Especially the time related reliability has to be considered in the demand modelling for the supply planning across all modes. Further, within this study reliability was quantified for the first time in Switzerland
Methodology:
For measuring the impact of reliability a questionnaire was developed around a kernel of three stated preference experiments. This method was chosen, because hypothetical questions in this context are able to address the research questions in detail. The only way to estimate the willingness to pay for reliability and quantify this value is by asking hypothetical questions. This problem arises particularly in the Swiss context where additional fees are not currently present except for the obligatory annual motorway tax.
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