Abstract
Recently, a new Head-Up Display (HUD) which has a more inclined virtual image along the road surface than before has been proposed. In this study, we used a driving simulator to evaluate the conditions under which the shape of the vehicle information, such as speed, was acceptable or not; even when the vehicle information was deformed by the driver's head motion. As a result, the specification was defined as the parallax angle of the upper and lower ends of the vehicle information zone.
