This paper presents a first attempt to better understand the influence of key events and critical incidents on transport mode choice switching behaviour. The research problem has been divided into three sub-problems: How do key events and critical incidents affect the composition of choice sets; How do key events and critical incidents influence people’s attitude towards available mode alternatives, and How do key events and critical incidents influence people’s mode choice behaviour. In total, 500 questionnaires were distributed using a convenience sample. A total of 196 (representing a response rate of 39%) were returned by mail. The data of 173 respondents were usable for analyses. These 173 respondents reported 309 key events and critical incidents that influenced their mode choice behaviour. The analyses focus on the most frequently occurring key events: a move from one place to a nother, first job, change of work situation, getting a drivers license, and getting a car. The effects of these events on choice set composition, attitude, and mode choice were investigated. The study shows that the selected key events result in changes in choice set composition, mode characteristics, attitudes against aspects of mode alternatives, and mode choice.
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