Development of Accident Models by Collision Type at Roundabout

This study deals with traffic accident of roundabout by collision type. In pursuing the above, this study gives particular attention to developing the appropriate models using Tobit model. The main results are as follows. First, three Tobit models (by collision type) which are statistically significant(their values are 0.858, 0.918 and 0.859) are developed. Second, t-test results show that there are no differences between the predicted and actual values. Finally, such the common variable as traffic volume, and such the specific variables as diameter of central island, the number of circulatory roadway, approach width and average of the number of approach are adopted in this study.