 Measures such as helmet and seat belt wearing rates have been used effectively in assessing road safety behaviour, as have speed measurements and conflict studies, and RAP star ratings provide a set of safety performance indicators for road infrastructure.Star ratings are used to show the likelihood of a fatal or serious crash and how well the road infrastructure would protect from death or serious injury when a crash occurs.By systematically inspecting roads, countries can develop an understanding of the level of risk built into their road networks.