Passive vs. Active Safety Belt Systems in Volkswagen Rabbits: A Comparison of Owner Use Habits and Attitudes
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Summary
This 1976 study, conducted by Opinion Research Corporation for the National Highway Traffic Safety Administration, compares owner usage habits and attitudes toward passive versus active safety belt systems in 1975 model year Volkswagen Rabbits. The research was motivated by the unique opportunity presented by Volkswagen, which offered a passive restraint system (an over-the-shoulder belt with a foam-padded knee pad and automatic retractor) alongside a conventional active system (lap and shoulder belts with a starter interlock and warning buzzer). The primary objective was to determine whether the passive system, which requires no manual buckling, resulted in higher usage rates and more favorable attitudes than the active system. The methodology involved two waves of surveys administered to owners of both systems. Data were collected via telephone interviews and follow-up mail questionnaires. The first wave occurred shortly after purchase (average ownership of 4.3 months), while the second wave occurred after approximately eleven months of ownership to assess long-term habits. The study included 2,196 passive system owners and 561 active system owners. The analysis focused on self-reported belt usage, the status of the starter interlock (whether it remained operative or was defeated), comfort ratings, and reasons for system selection. The findings revealed significantly higher usage rates for the passive system. Approximately 79% of passive system owners reported wearing their belts "almost always," compared to only 50% of active system owners. This disparity persisted regardless of ownership duration. The study identified the defeat of the starter interlock as the primary driver of this difference. Only 18% of passive system owners had defeated their interlocks, whereas 82% of active system owners had disconnected theirs, often by simply pulling a plug. In contrast, defeating the passive interlock required cutting wires at the door, a more difficult process. Consequently, owners with operative interlocks in both groups reported high usage rates (98% for passive, 70% for active), while those with defeated interlocks showed similar, lower usage rates (53% for passive, 51% for active). Additionally, passive system owners reported more favorable attitudes, with 83% holding a favorable impression of the belt compared to 67% of active owners. Passive system users also rated the belts as more comfortable (73% vs. 45%) and cited ease of use as a key advantage, though they noted difficulties with door entry and exit. The study concludes that the passive restraint system with an operative starter interlock is highly effective at inducing safety belt use in Volkswagen Rabbits. The high usage rates are attributed to the system's design, which makes defeating the interlock difficult and provides a comfortable, convenient user experience. However, the authors note that further research is required to determine if these findings apply to domestic vehicles, particularly those in higher weight classes, before broader implementation can be recommended.
Key finding
Owners of passive restraint systems reported 79 percent belt usage compared to 50 percent for active restraint systems, a difference driven by an 82 percent interlock defeat rate among active system owners versus 18 percent for passive system owners.
Methodology
survey
Sample size: 2757
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- Empirical Findings: observational prevalence