According to a recent NTUA research co-authored by G.Yannis, E.Papadimitriou and J.Gollias from NTUA, published in Accident Analysis and Prevention Journal, dealing with the ‘Multilevel modeling for the regional effect of enforcement on road accidents’, the effect of the intensification of Police enforcement of drinking and driving on the number of road fatalities at national and regional level was investigated, demonstrating that there are significant spatial dependences among road accidents and enforcement, which are interpreted better by qualitative similarities of the regions than geographical adjacency.