Motorcycles are more likely to be involved in road crashes than other vehicles. Speeding violations are common among motorcyclists and in-depth data on fatal crashes show that 30 percent of accidents were linked to speeding. The aim of the study was twofold, the first one aimed to increase our understanding of contributing factors leading up to an accident, the second to investigate key determinants influencing motorcyclists´ intention to speed using the Theory of Planned Behaviour. Based on this, both a quantitative and a qualitative approach were chosen divided into four different sub-studies: registry study, questionnaire study and two interview studies. In this presentation the focus will be on the first and the second study.