Missouri, U.S.A., etablerede, at brugen af sikkerhedsseler om natten blandt bilister, impliceret i sammenstød, lå ca. 10% lavere end gennemsnittet (Beitel, Sharp og Glauz, 1974).
For example, research in Missouri, U.S.A. found that seat belt use at night by crash-involved drivers was approximately 10% lower than average (Beitel, Sharp and Glauz, 1974).