Abstract
Seat belt information was designed on the basis of a model of seat belt use, where a linear combination of beliefs about discomfort when wearing a belt, and beliefs about injury reducing effects of belts were regarded as determinants of ''disposition of belt use''. The usage effects decreased over time, but seemed to increase again after the belief follow-up. The nature of the relations between usage and each of the two factors were discussed as well as a multiplicative weighting of discomfort and injury reducing effects.