
A very interesting statistic pulled from the DOT Research Note is the difference in seat belt use between primary enforcement states—92.1%—and secondary enforcement states—83.0%. Primary enforcement means a peace officer can pull a vehicle over for a seat belt violation, whereas in secondary enforcement states, a peace offer cannot pull a vehicle over for that reason, but if the vehicle is already pulled over for another reason, like speeding, then the officer can issue a ticket for a seat belt violation.
NHTSA credits the increased seat belt use rate to national campaigns such as Click-it-or-Ticket and even the famous advertising campaigns from the 1990s like Vince and Larry, the crash test dummies. One could say that with less than 10% of Americans not wearing their all-important, life-saving seat belts, that you’d have to be dummy to not buckle up.