Abstract
This study deals with the relations between type of trumpet interchanges and traffic·accident rate. In pursuing the above, this study gives particular attentions to surveying the accident data and geometric characteristics of interchange, and analyzing the relationships between two factors. Main results are the followings. First, the Trumpet type B using the under-pass system has the highest accident rate among 4 different types. This can be explained by the factor that the type B has the rapid change of speed in the junction area from the main line to the loop of interchange. Second, the multiple regression analyses show that each type of trumpet interchange has the different independent variables. This can be explained that each trumpet interchange has the different accident characteristics.