United States Department of Transportation
i
Safety Belt Interlock System Usage Survey [1976]
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1976-08-01
[PDF-2.55 MB]
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Alternative Title:Safety belt interlock system usuage [sic] survey
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Edition:Final report
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Abstract:This research is intended to measure the effectiveness of various use-inducing systems in increasing safety belt usage. Specifically, the objectives are: (1) to determine if the 1975 warning system issued in response to P.L. 93-492 is effective in increasing usage; (2) to ascertain drivers' reactions to this and other systems on 1975 model cars; and (3) to continue to monitor safety belt usage in the general traffic population. Methods used to carry out the research include: (1) an observation study to record safety belt usage among drivers and front outboard passengers in 1975, 1974, and 1973 private passenger cars; (2) a telephone interview among owners/drivers of 1975 model cars from the observation study; and (3) telephone interviews with a sample of Spring/Summer registered owners of 1975 model cars. The latter sample was required in order to obtain a sufficient number of interviews with owners of cars having the 1975 warning system. Results show that the 1975 warning system is not very effective as a use-inducing system. "'lost effective is a system that includes (1) a reminder light that goes on and stays on until the belt is fastened, and (2) a sequential logic circuit that requires to first be seated and second to buckle the belt. Drivers' attitudes toward the use of safety belts, and perceived comfort of both the lap belt and shoulder harness are also key factors which are correlated with usage. /Abstract from report summary page/
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