Descriptive research, Mixed method study both quantitative and qualitative data, aimed to study self efficacy theory application for traffic accident prevention among senior people drivers in municipality, Khon kaen, Thailand. The participants were senior people both female and male > 60 yrs 400 persons. Data were collected both qualitative and quantitative method. Data analysis by using SPSS program for quantitative data as well as content analysis for qualitative data. The results showed that perceived self efficacy and expect outcome of car driving, in additional car driving behavior among elderly people were in high level. The characteristic variables correlation with safety behavior of car driver elderly were sex, education, duration of car driving, main occupation, Income/month, and car driving license. The variable correlation of traffic safety behavior were self-efficacy and expect outcome of car driving of elderly.