A research titled ‘Impact of enforcement on traffic accidents and fatalities: A multivariate multilevel analysis’co-authored by G.Yannis, E.Papadimitriou and C.Antoniou from NTUA was published in the Journal Safety Science in June 2008. In this research, distributional assumptions of the Poisson-family are considered for the counts of road accidents and fatalities of the various regions of Greece. The combination of the model results with additional behavioural data led to the conclusion that enforcement intensification has a direct impact on the improvement of driver behaviour and attitude and subsequently on the reduction of road accident and fatalities.