The effectiveness of crash helmet wearing for riders of heavy motorcycles is not a matter of serious discussion in the public. Wearing rates of up to 95% are usual. 0n the other hand, crash helmets are not very commonly seen with mopedists and the wearing of a helmet For a non-racing bicyclist seems to be out of discussion For most people. (A moped is defined in Switzerland as a motorcycle with 50 com and a maximum speed of 30 km/h, also called "mofa"). However, data on head injuries within the latter two categories strongly suggest the usage of suitable head gear.
After a literature review on head injuries with light two—wheelers and helmets the results of three different in-depth studies with a total number of 940 cases (243 bicycle and 697 moped accidents in the Canton of Zurich) are discussed as to l. the exact localization of head impacts with bicyclists supplying data For the design of suitable helmets For bicyclists (1. study) , 2. the difference in severity of' head injuries with bicyclists and mopedists (2. study), and 3. as to the general injury severity and location with mopedists (3. study).