The present study aims at identifying determinants of risk behaviour and accident involvement in traffic. The results are based on a self-completion questionnaire survey carried out among a representative sample of Norwegian drivers drawn from the driver's licence register. The data was collected in year 2000 and 2001 (n=2614). The questionnaire included measures of attitudes, risk behaviour and involvement in accidents and near accidents. The results showed that attitudes towards traffic safety issues influenced involvement in risk behaviour in traffic, especially attitudes towards rule violations and speeding. Risk behaviour had an effect on involvement in near accidents and accidents. Variations in attitudes and risk behaviour were related to age and gender.