Automotive industry and policy makers have taken all kinds of measures to reduce the number of (fatal) accidents and make driving safer. However, drivers are a central factor in establishing safety. While safety measures are important in making driving safer, if drivers do not comply, efforts by industry and policy makers may not be effective. In this chapter, we look at driving behaviour, in particular at driving styles. We discuss the phenomenon of behavioural adaptation and look at efforts to apply technology to make drivers change their behaviour.