In 2004, for the 16th time since 1972, a survey on the travel behaviour of the Swiss population was conducted. The database resulting from this project (Travel Market Switzerland 2004) is still the most extensive one on private trips of the Swiss population. This report gives an overview on - Method/ procedure of data collection (cf. chapter 2), and - Results (cf. chapter 3). Furthermore, 1998 research on the clustering of travel situations based on motivation factors was replicated as part of this report (Market segmentation by motivation: results of 1998 research revisited). Please refer to chapter 4. To give insight into previous publications on Travel Market Switzerland, we made a compilation of all related papers published by the authors of this report; please refer to chapter 5. Finally, a list of all currently available variables gives an impression of data available for research (cf. chapter 6).