Comprehensive literature review has been performed related to analyses of road traffic accidents involving powered two-wheelers (PTW). It became obvious that many projects, in particular European research projects, studies from French and Italian research institutes and from Australia have been working on this topic; however, results can hardly be compared since the definitions of many variables vary, different injury coding are used and all analysed in-depth accident datasets are based on greatly differing inclusion criteria. The PIONEERS project took this burden and established definitions for relevant Accident Scenarios and body regions which may form a new common understanding and will accelerate harmonization processes in this research field. Furthermore, several datasets from Europe and Australia (Compilation of macrostatistical European accident data as well as data from national statistics and in-depth accident investigations) of latest years have been analysed to provide a current understanding of the accident occurrence of powered two-wheelers