Amongst OECD countries in 1989, there were large variations between countries regarding road safety. For instance, deaths per 10 million vehicles are in a ratio of 1 to 4 (Sweden 2,087 vs Portugal 8.616) and deaths per 100 million motor vehicle kilometres in a ratio of 1 to 7 (UK 13 vs Spain 88). Portugal had the highest death rate per 100,000 population and Norway the lowest (31.5 compared with 9.0). Specific factors such as population density, condition of the road network, topography, climate, local style of driving explain part of such differences but another part stems from differences in the seriousness with which individual countries treat road accidents. If all European countries reached the present highest levels of road safety a reduction of approximately 30% in the number of deaths on the road could be achieved.