Comprehensive literature review has been performed related to analyses of road traffic accidents involving powered two-wheelers. It became obvious that many projects, in particular European re-search projects by the EU, 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 es-tablished definitions for relevant Accident Scenarios and body regions which may form a new common understanding and will accelerate harmonization processes in this research field. Fur-thermore, 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 pow-ered two-wheelers.

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