Browse Publications Technical Papers 751006
1975-02-01

Seat Belt Use Inducing System Effectiveness in Fleet Automobiles 751006

Seat belt use inducing systems and seat belt use counting systems were installed in fleet vehicles of the Automobile Club of Southern California. The results were:
  1. 1.
    Mean group seat belt use for three use inducement systems were sequencing system 77%; ignition interlock system 86%; and speed limiting interlock system 81%.
  2. 2.
    There was no significant change of seat belt use for any of the three inducement systems according to time of exposure.
  3. 3.
    There was a significant difference between previous no system seat belt use (mean 24%) and no-system seat belt after exposure to the use inducing system (mean 49%).
  4. 4.
    The vehicle drivers were given a questionnaire at periodic intervals, the results of which indicated higher self-reported than actual seat belt use. Also specific confusion, inconvenience and discomfort factors were identified and rated.
The conclusions were:
  1. 1.
    use inducing systems cause a significant increase in seat belt use of fleet vehicle drivers. This increase, while probably of a different magnitude, will occur in vehicles operated by the general public.
  2. 2.
    No one use inducing system tested was significantly superior in increasing seat belt use than another.
  3. 3.
    Temporary exposure to a use inducing system appears to cause a permanent increase in the non-induced seat belt use of exposed subjects.
  4. 4.
    Improvement of seat belt hardware and geometry related to the human factor engineering aspects may further improve seat belt use.

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