Speed and Crash Risk

This study aims to document objectively the relationship between vehicle speed and crash risks. It assesses to what extent recent changes in speed limits or the wide-scale introduction of automated speed enforcement have moderated actual average speeds, and whether this has delivered the safety impacts that theoretical models of the relationship between speed and crashes suggest. The cases analysed come from ten countries: Australia, Austria, Denmark, France, Hungary, Israel, Italy, Norway, Sweden and the United States. The report was prepared by the ITF’s permanent working group on road safety, the International Traffic Safety Data and Analysis Group (IRTAD).  The full report is available at https://www.itf-oecd.org/speed-crash-risk