The International Road Traffic and Accident Database (IRTAD) of the International Transport Forum (ITF/OECD) published a Special Report on Serious Road Traffic Casualties aiming to identify and assess methodologies for linking different sources of accident data in order to develop better estimates of the real number of road traffic casualties. The report provides a number of recommendations on the use of police and hospital data, and makes suggestions for an internationally agreed definition of serious injury. pdf5