Developing the Sideswipe Accident Model at Roundabouts

This study deals with the roundabout accidents. The goal of this study is to develop the sideswipe accident models at roundabout. In the pursuing the above, this study gives particular attentions to collecting the data of geometric structure and accidents of 54 roundabouts in Korea and developing the Poisson and negative binomial regression models. The main results are as follows. First, sideswipe accident is analyzed to be the highest frequency that is 39.5% of total accident data. Second, Poisson models which is statistically significant is developed. Finally, traffic volume per approach( $X_1$ ), number of circulatory roadway( $X_3$ ), operation of parking lot( $X_4$ ) and width of circulatory roadway( $X_6$ ) are adopted as the common variables. This study might be expected to give some implications to the accident research on the roundabout.