Haddon's model for traffic-related injuries

'Haddon's model for traffic-related injuries' can also refer to...


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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.

Haddon's model

Environmental Factors

Haddon's model

Human Factors

Vehicle Factors



Pre-injury Phase



Poor visibility


Injury Phase

Resistance to injury

Hard, sharp surface material


Lack of enforcement

Post-injury Phase

Existing conditions

Rapid deceleration

Emergency medical response

Lack of funding for care and rehab

Subjects: Public Health and Epidemiology.

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