Is the result consistent with trends in the general population?
Any survey has to be questioned if it comes up with results that are inconsistent with trends observed in the whole population. These trends show a steady fall in accident rates and casualty rates throughout this century despite huge increases in free flowing traffic speeds. More specifically, injury accident rates fell by 30% in the UK during the 1980s whilst road speeds increased. If the violation of general statistical rules such as these are not enough, some of the specific logical errors in this study damn it even more comprehensively. • The Irrelevance of using Average Speeds • Injury accidents only happen once for every 1.8 million kilometers driven in the UK. This makes them, at worst, a once in a lifetime experience even a high mileage motorist. An accident results from an exceptional combination of circumstances, and certain demographic groups, locations and conditions drastically effect accident rates. What relevance can average speed of the whole vehicle population have to
