A Study of Nighttime Seat Belt Use in Indiana [Traffic Safety Facts]

NHTSA · 2007 · ROSA P / United States. Department of Transportation. National Highway Traffic Safety Administration

archive: archived pipeline: cataloged verified

Get this paper ↗ (full text — opens at the source; we link to it, we don't host it)

Summary

This study addresses the gap in traffic safety data regarding nighttime seat belt usage, which is often underrepresented in direct observation surveys that predominantly occur during daylight hours. While nationwide daytime seat belt use exceeds 80 percent, prior research suggested nighttime rates might be lower, though such data was limited to specific geographic areas. The primary objective was to obtain a statewide measure of nighttime seat belt use in Indiana and compare it to daytime usage. A secondary goal was to assess changes in both daytime and nighttime usage associated with the May 2006 "Click It or Ticket" enforcement campaign. The methodology involved two statewide nighttime observation surveys conducted in Indiana, designed to match the state’s daytime probability-based surveys. The first nighttime wave occurred from April 17–30, 2006 (pre-campaign), and the second from June 5–18, 2006 (post-campaign). Trained staff used night vision equipment to observe shoulder belt use, driver and passenger demographics, seating position, and vehicle type. Data collection sites and timing mirrored daytime surveys as closely as possible, though logistical constraints prevented simultaneous day and night data collection at all sites. The study included passenger cars, SUVs, vans, pickup trucks, and box trucks. Results indicated that overall nighttime seat belt use decreased significantly from 79.0 percent in the pre-campaign wave to 74.0 percent in the post-campaign wave (p<0.001). This decline was statistically significant for drivers (p<0.001) but not for passengers. Gender disparities persisted, with males showing significantly lower usage than females in both waves, and both groups experiencing significant decreases post-campaign. Vehicle type analysis revealed that pickup truck occupants had the lowest usage rates (61.7% pre-campaign, 52.2% post-campaign), significantly lower than car, minivan, and SUV occupants, consistent with Indiana’s law exempting pickup trucks from seat belt mandates. Large van occupants also showed significantly lower usage than car and minivan occupants. Comparing daytime and nighttime data revealed that pre-campaign usage rates were similar between day (79.7%) and night (79.0%). However, post-campaign daytime usage increased significantly to 84.3%, while nighttime usage dropped to 74.0%, creating a 10.3 percentage point gap (p<0.001). The study concludes that while the enforcement campaign successfully increased daytime compliance, it coincided with a significant decrease in nighttime compliance. This divergence highlights the need for targeted strategies to address nighttime seat belt use, particularly among drivers, males, and occupants of pickup trucks and large vans.

Key finding

Statewide nighttime seat belt use in Indiana fell significantly from 79.0 percent to 74.0 percent across the May 2006 mobilization, while daytime use rose, leaving daytime use 10.3 points higher than nighttime use afterward.

Methodology

field_study

Provenance

The full processing record for this entry. Every stage of this paper's journey through the pipeline is logged — what ran, with which tool and model, how many attempts it took, and when it last completed. Discovered via bulk_ingest_rosap on 2026-05-23 (8 acquisition events logged).

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

Topics

Ranked by relevance to this paper. Hover a topic for its definition.

• seat belt use

Information type

What kind of knowledge this paper contributes, grouped by family — independent of topic (what it is about) and method (how it was studied).

• Empirical Findings: observational prevalence