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How to drive modal shift is one of the primary issues to create a sustainable society. By encouraging people to migrate from private car use to public transport, city planners can prepare for a super-aged society, reduce greenhouse gas emissions and mitigate negative externalities of private car use such as congestion, accidents, and noise. To achieve these goals, city planners are required to understand whether public transport usage can be increased by improving the service quality, and what roles user satisfaction and loyalty play in the process. The relations between service quality, user satisfaction, loyalty and user frequency have been studied for a long time. However, most of the studies are based on cross-sectional analysis. Cross-sectional analysis is less powerful in detecting causality as it does not show pre-post relations nor lagged effects between variables. To investigate causal and non-simultaneous relations among quality, satisfaction, loyalty and user frequency of public transport, we used data of the Benchmarking in European Service of Public Transport survey from 2001 to 2015 in 4 European cities, and applied Vector Auto Regressive (VAR) analysis. The result shows that improvement of service quality has positive effects on user’s satisfaction, loyalty and user frequency and that better satisfaction leads to higher loyalty and user frequency. More importantly, the result also shows that behavioral modification (change in user frequency) occurs with time lag while psychological modifications (changes in satisfaction and loyalty) occur immediately after changes in service quality. The findings suggest that city/transport planners ought to keep improving the service quality of public transport and monitoring the achievement from a long-term perspective.
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