The purpose of this paper is to report on a study made by Volkswagen, comparing the results from different institutes on the passive safety of vehicles. These institutes use accident data from the police or from insurance companies. They derive a rating from these figures and publish it as a guideline for the customer, "to choose safety."
At least their publications seek to give this impression:
Title of the leaflet of the British Ministry of Transportation: Buying a Car? Choose Safety.
The Australian Monash University Accident Research Centre uses the title: How does your car rate in a crash?
Folksam, a Swedish insurance company is very clear: How safe is your car?
Clearly they feel that their data can answer this question.
It is the purpose of this paper to summarize a number of observations which make it hard to believe that we are already in a position to evaluate the passive safety of vehicles from accident statistics alone.