What percentage of fatalities could not determine seatbelt usage according to the NHTSA study?

The correct answer, which indicates that 13% of fatalities could not determine seatbelt usage according to the NHTSA study, highlights the importance of gathering accurate data in analyzing the effectiveness of safety measures like seatbelts. This percentage reflects incidents where data on seatbelt usage was either not recorded or was deemed inconclusive during investigations. Understanding this statistic is crucial for emergency responders and policy makers to identify areas for improvement in vehicle safety protocols and public awareness campaigns. Collecting comprehensive data on seatbelt usage helps in developing targeted strategies to reduce fatalities and improve overall road safety, as unknowns in seatbelt usage may indicate a gap in compliance or reporting that needs to be addressed.