The "Buckle-Up" Dashboard Sticker

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Abstract
A vehicle dashboard sticker that read "SAFETY BELT USE RE- QUIRED IN THIS VEHICLE" was found to double the use of safety belts by front-seat passengers. During an initial two-week baseline phase, 24 graduate students (who always buckled up when driving) recorded safety belt use by front-seat passengers in their automobiles. The mean baseline belt use of 476 passengers was 34%. Subsequently, buckle-up stickers were placed in the 24 vehicles, and passenger belt increased to 70% (N = 448). Two weeks later the stickers were withdrawn and passenger belt use dropped to 41% (N = 406). Replacement of the 24 stickers for two final weeks resulted in 78% belt use by 392 front seat passengers.