Abstract
Acceleration- (g-) force and mean speed are measured onboard city buses in regular traffic. The means of Right/Left, Gas/Brake, the composite g-force and speed are correlated with drivers' frequency of (bus) accidents for differet time periods. No stable relationship is found, only a weak tendency for the dimensions of mean speed and Right/Left to predict bus accidents when time periods of one to five years are used. The many problems inherent in this kind of field research are discussed and some remedies proposed. (Author/publisher).