This idea can be found in the so-called SUNflower approach. Such understanding will identify policy improvements that are most likely to reduce road casualties. The SUNflower approach started with comparing three countries with the lowest accident levels in the world: Sweden, United Kingdom, and the Netherlands (Koornstra et al., Analyses included national road safety strategies, changes in overall risks and fatality risks of comparable road types, road user modes and collisions between modes. A case study approach on specific topics has been added to the more general picture.