The American physician and founding director of the National Transportation and Safety Commission, William Haddon (1926–1985) analyzed the factors responsible for traffic-related injury. In 1963, he produced a model of three phases (before, during, and after injury occurred), and the human, vehicle-related, and environmental factors that were associated with the injury. He presented these in what became known as Haddon's matrix, shown below.
Resistance to injury
Hard, sharp surface material
Lack of enforcement
Emergency medical response
Lack of funding for care and rehab
Subjects: Public Health and Epidemiology.