The installation of various driving safety support systems has been mandatory. However these systems may interfere with driver's operation and this problem leads the driver to distrust the system. If driver's intention is detected accurately, these systems will be more acceptable for the drivers. The purpose of this study is detecting driver's intention of lane departure. The lateral velocity during lane change in driving simulator was analyzed. The results revealed that the lateral velocity was higher in intentional lane departure than unintentional case. In addition, that of lane departing to the right was higher than to the left.
