Daytime and Nighttime Seat Belt Use by Fatally Injured Passenger Vehicle Occupants.

Tison, Julie; Williams, Allan F.; Chaudhary, Neil K. · 2010 · ROSA P / United States. National Highway Traffic Safety Administration

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Summary

This study investigates the disparity in seat belt use between daytime and nighttime hours among fatally injured passenger vehicle occupants, aiming to identify specific high-risk populations and understand the factors driving lower nighttime compliance. The research was motivated by the disproportionate contribution of nighttime fatalities to highway death tolls and the limitations of existing daytime observational surveys, which fail to capture the behaviors of high-risk drivers active during night hours. By analyzing data from fatally injured occupants, the authors sought to determine how personal, environmental, and vehicle characteristics influence seat belt use differentially across day and night, and to assess the impact of primary versus secondary enforcement laws. The analysis utilized data from the Fatality Analysis Reporting System (FARS) for the period 1998–2007, comparing seat belt use among fatally injured front-seat occupants during daytime (4 a.m.–8:59 p.m.) and nighttime (9 p.m.–3:59 a.m.). These findings were correlated with daytime observational survey data from the National Occupant Protection Use Survey (NOPUS). The study employed binary logistic regressions to examine predictors of belt use across various demographics, including gender, age, vehicle type, road type, rural/urban location, driver record, and blood alcohol concentration (BAC). Additionally, the study compared outcomes in states with primary versus secondary seat belt laws and analyzed states that transitioned from secondary to primary enforcement during the study period. The results confirmed that seat belt use among fatally injured occupants was consistently lower at night than during the day, with an average difference of 18 percentage points. While both daytime and nighttime use rates increased over the decade, the gap persisted. Groups with the lowest overall seat belt use included males, younger occupants, pickup truck occupants, residents of secondary enforcement states, rural drivers, and those with high BACs. Notably, alcohol-impaired drivers (BAC ≥ 0.08 g/dL) comprised 68% of fatally injured drivers killed at night, yet their seat belt use remained low and consistent between day (27.7%) and night (26.1%). Conversely, groups traditionally associated with higher compliance, such as occupants aged 45 and older, car occupants, and drivers with clean records, exhibited the greatest disparity between day and night use. States with primary enforcement laws demonstrated significantly higher seat belt use than secondary states, particularly at night, and states that upgraded to primary enforcement saw substantial increases in nighttime compliance. The study concludes that the lower nighttime seat belt use is largely driven by the presence of high-risk populations, particularly alcohol-impaired drivers, rather than a universal decline in compliance among all drivers. The findings suggest that nighttime enforcement strategies should specifically target alcohol-impaired drivers, pickup truck occupants, and rural residents. Furthermore, the significant impact of primary enforcement laws on nighttime use indicates that legislative changes are a critical tool for improving safety during high-risk hours. The research highlights the need for targeted interventions that address the specific behaviors and demographics prevalent during nighttime driving.

Key finding

Nighttime seat belt use among fatally injured occupants averaged 18 percentage points lower than daytime use, with alcohol-impaired drivers comprising more than two-thirds of fatally injured drivers killed at night and showing only 26% belt use.

Methodology

dataset

Provenance

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Summary generated by qwen3.6-27b-prismaquant on 2026-06-10; verification: verified.

Topics

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• seat belt use
• demographic disparities

Information type

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• Empirical Findings: observational prevalence, crash risk outcomes