Light vehicle occupant ejections--a comprehensive investigation

Area of Science:

• Road safety
• Vehicle safety engineering
• Accident analysis

Background:

• Occupant ejections are infrequent but highly dangerous events in light vehicle crashes.
• The harm to ejected occupants is disproportionately high compared to the frequency of ejections.
• Despite increased safety belt usage, ejection rates remain unchanged.

Purpose of the Study:

• To analyze the frequency, causes, and consequences of occupant ejections in light vehicle crashes.
• To identify the primary ejection paths and modes of vehicle component failure leading to ejections.
• To understand the role of safety belts and other factors in occupant ejection events.

Main Methods:

• Analysis of data from the National Accident Sampling System (1988-1991) and the Fatal Accident Reporting System (1982-1992).
• Categorization of ejection events, including partial and complete ejections.
• Identification of primary ejection paths (e.g., glazing, doors) and failure modes (e.g., latch failure, disintegration).

Main Results:

• Occupant ejections constitute approximately 1.5% of crash-involved occupant events.
• Closed glazing is the leading cause of ejection, followed by doors and windshields.
• Ejections themselves, not pre-ejection impacts, cause the majority of harm to occupants, with ejected occupants suffering greater harm.

Conclusions:

• Occupant ejections remain a significant safety concern in highway crashes.
• Current safety measures, including safety belts, have not reduced ejection rates.
• Targeting "closed glazing" and "door" integrity is crucial for reducing occupant ejections and associated harm.