Travel behaviour research has a pivotal role to play in informing the current worldwide debate over the degree to which the growth in personal travel, notably by private motor vehicle, should be encouraged or controlled. At stake are complex public interests concerning air quality, energy, lifestyle, economic development and the built environment. This international collection of papers on current methodological and substantive findings from the analysis of personal travel is written by leading travel behaviour researchers from the social and engineering sciences. It is organised in four sections: traveller activity and perception, stated preference methods, dynamic behaviour, and improvement of behavioural travel models.