Seat Belt Use | US Department of Transportation
Aug 24, 2015· Only daytime driving (7 a.m. to 6 p.m.) is reflected in the NOPUS data, and the sample size (1,700 sites) is relatively small (U.S. DOT National Highway Traffic Safety Administration, 2011). However, compared with self-reported data collected by states, the data collected by observation give a stronger indication of actual seat belt use.