Abstract
Reactive torque is influenced by road roughness, since a tire and a steering are connected mechanically. Therefore a driver can feel the road roughness, however as it negatively influences steering behavior, it is required to be evaluated. In this study, the influence of reactive torque on steering behavior of the driver and the vehicle motion were investigated by using the driving simulator with a motion platform. As a result, it was revealed that the steering behavior was deteriorated by disturbance noise due to road roughness.