The interventions assessed in this research included awareness-raising, safety pledges, individual and group goal-setting (with goals assigned by managers or developed by workers), directives from management, and individual and group competitions for rewards. In general, the researchers found that high-involvement interventions were effective in changing the targeted behaviour, and that in some cases these also seemed to be associated with positive changes in other safe driving behaviours. In addition, individualized public feedback was more effective than generic feedback, and worked well for those who were initially non-compliant with low-level, non-intrusive interventions.