Abstract
This study examined the effects of the positive message “thank you” in deterring parking violation. To examine the effects of the message to evoke the intention of deterring parking violation, we conducted the questionnaire survery for university studens. In addition, we examine the effects of the message to behavior of deterring parking violation by a social experiment at the university campus. The results show that the effect of the positive message “thank you” had the greatest effects in positive messages, and was more effective than the negative message “prohibited” which is generally used much, in the conscious level. Further, it was indicated that the positive message "thank you" is also more effective than a negative message "prohibited" even in the behavior level as a result of a social experiment.
