Abstract
The term "risk" is illustrated from different points of view and defined and explained as a central content of safety science. In representing elements, possibilities, claims and aims of riskology the systematic determination of accident types and risk types is demonstrated. Investigations in riskology require the correct differentiation between "safety" and "protection". A judgement of risk examination is made to recognize accident concentrations and centers of hazard at motorcycle riding. Continuing it is possible to derive efficient measures for motorcycle accident prevention.