The International Road Traffic and Accident Group (IRTAD) of the International Transport Forum (ITF/OECD) published recently a new Report “Speed and Crash Risk”, with the active contribution of NTUA. After reviewing the current knowledge on the relationship between speed and crash risk, this report analyses eleven cases from ten countries that have recently changed speed limits or introduced a large-scale automatic speed control. The analysis confirms the very strong relationship between speed and crash risk and that higher speed is associated with increased occurrence and severity of road crashes.