Professional drivers are more likely to commit traffic violations compared to private drivers. The purpose of this study is to improve existing knowledge concerning the motives behind such traffic violations, focusing in particular on speeding and non-usage of seat belts. The study is divided into two parts: a qualitative study and a quantitative study. In the qualitative study, eight people who represent employers and various organisations within the professional driving sector were interviewed. The quantitative study consisted of a survey that measured professional drivers' attitudes towards speeding and seat belt usage.