Driver Behavior Analysis at Roundabout Considering Geometry Impact by Applying Driving Simulation

In recent years, the installation of roundabout (RAB) has been promoted in Japan since roundabouts can be operated safely and at the time of disaster. However, due to the limited cases, the impacts of geometry under Japanese situation have not been totally understood and certificated. Thus, in this analysis, five roundabouts which have different geometric structures were created for examining the impacts through conducting experiments using a driving simulator (DS). It was confirmed that the influence of the entry radius was strong, and the larger the entry radius, the faster the entry speed and the farther the driving position from the RAB center. Moreover, from this study, it is possible to confirm the effectiveness of using DS for examining the geometric impacts. The application of DS experiments under more conditions is expected in future.