Transport planning and its methods are dominated by the tradition to collect one-day cross sectional travel behaviour data. Despite successful multi-day travel surveys abroad there is no recent longitudinal survey conducted in Switzerland so far. Consequently, there is data missing to answer those questions like: • How do people mix the different travel modes ? • Which complex coordination mechanisms are allocating tasks and activities within the household ? • How large are daily activity spaces of different groups ? • How stable is the travel behaviour over time? This data gap was overcome by a recent SVI-project called “Study of the stability of travel behaviour”. In autumn and winter 2003, 99 households were asked about their travel behaviour for 6 weeks. The paper describes the survey itself in terms of purpose and contents. Moreover it shows first analysis results and gives an outlook of research potential since the data offers not only opportunities to analyse the temporal and spatial structures of individual travel behaviour but also the mechanisms of activity planning and scheduling within a household.
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