It is extremely difficult to find safety elements for motorized two-wheelers. For this reason it is important to begin by examining the accident sequences and by clearly analysing the main points of injury as well as the way in which the injuries arise. What emerges is a very complex accident sequence in the case of two-wheelers which involves the danger that one safety element optimised with regard to only one problem can result in disadvantages when the overall accident severity is examined. The leg protection as an isolated safety element has to be mentioned in this connection.If it is not properly designed the influence it. has on the movement sequence can result in increasing the risk of injury to other parts of the body. A satisfactory solution with an airbag might be a way out of the dilemma.