Formulation of Driver Judgment Process around Curves for Deviated State Detection

The objective of this study is to propose indices that detect deviated states of drivers during driving considering their judgment process and using a road environment and natural driving behavior database. To this end, the authors focus on curved roads because as road curvature changes continuously drivers need to adapt their behavior to not go wide of the lane or the road. The drivers’ speed choice behavior around curve situations was focused upon, and a speed choice process was formulated. Moreover, the validity of the formulated speed choice behavior in curve situations was examined using the real vehicle and the simulator.