Results of a direct observation study of safety belt use in Michigan conducted in April 1989 were compared with results of eleven previous surveys (December 1984; April, July, and December 1985; April, July, and December 1986; April, July, and November 1987; and May 1988). In the current survey, 17,574 occupants in 12,184 cars and light trucks were observed between March 27 and April 16, 1989. Use of safety belts did not change between May 1988 and April 1989. Front-seat restraint use among all motorists observed was 45.6% in April 1989 compared to 45.1% in May 1988 (the difference of 0.5 percentage points is not statistically significant because the estimates have a margin of error of plus or minus 2.8%). By age group, use rates were as follows in April 1989 (all seat positions): 62.7% among occupants age 0-3; 36.2% among occupants age 4-15; 36.6% among occupants age 16-29; 46.5% among occupants age 30-59; and 51.9% among occupants age 60 and older. Females continued to exhibit higher restraint use than males, 50.1% versus 38.8% in the current survey. As in previous surveys, restraint use varied by region of the state. Safety belt use has remained stable since December 1985 when use among front-seat occupants was 44.5%. Finally, front-seat belt use among those age 16 and over remains significantly higher than it was before Michigan's mandatory use law took effect (45.2% in April 1989, versus 18.3% in December 1984).

  • Corporate Authors:

    University of Michigan Transportation Research Institute

    2901 Baxter Road
    Ann Arbor, MI  United States  48109-2150
  • Authors:
    • Wagenaar, A C
    • Molnar, L
  • Publication Date: 1989-6

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: 63 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00610242
  • Record Type: Publication
  • Source Agency: National Highway Traffic Safety Administration
  • Report/Paper Numbers: UMTRI-89-12, HS-040 959
  • Contract Numbers: MDE-89-002A
  • Files: HSL, TRIS, USDOT
  • Created Date: Jun 30 1991 12:00AM