Introduction: Traffic accidents are recognized the main causes of fatalities and injuries, as well as a worldwide public health problem. Among the many factors that contribute to accidents, risky behavior is the most common cause of them. This study aimed to investigate factors related lack of driving discipline among Yazd city drivers in 2014.

Methods: This study is a cross-sectional study has been performed on 373 drivers of Yazd in 2014. The sampling method was convenience. Data were collected by questionnaire and analyzed with SPSS₁₆ software, using Pearson correlation tests, ANOVA, t-test and linear regression analysis.

Results: The data showed that average score of high-risk behavior was 81.41 and risk-taking attitudes and perceived risk were correlated with risky driving behavior significantly (p< 0.001). Among the variables entered into the regression model, risk-taking attitudes and risk perception could predict 35 percent of variance of risky behavior.) F= 27.2, R=0.59, R²= 0.35)

Conclusion: The results show that risky behaviors have influenced by risk-taking attitudes and perceived risk driving. So it is necessary to consider these factors in educational interventions