Integrated, holistic and linked data bases have been established in leading countries to match the records of crashes contained in police records with data from health, insurers and other sources to form a complete picture of the road crash problem and more recently the level of severity of injury occurring. These “matched databases” involves establishing memoranda of understanding between agencies to manage issue such as privacy and, integrity and confidentiality. Both the police report number and the real number are published annually since 1996.