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This paper proposes two approaches for reducing carsickness while watching an onboard display in a vehicle. The approaches are based on the sensory conflict theory to reduce a conflict of sensory information between the vestibular and the visual systems. Visual stimulus along with the original content is presented on the onboard display to provide optokinetic sensation of yaw rotation of a vehicle. Experimental study shows that the carsickness severity has been remarkably reduced by the proposed approaches.