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Head-up displays (HUDs) require drivers to perceive double images simultaneously, that is, the scene to the front and display images, and this simultaneous viewing of two objects may cause cognitive confusion during driving. In this paper, we discuss some factors that determine the appropriate area for HUDs. First we discuss the feeling of troublesomeness with consideration of eye movements during driving. Secondly, we investigated the situation wherein the driver in a trailing vehicle perceives the stop lamps of a lead vehicle. Upon these considerations, we conclude that in the vertical direction the area under 4 degrees below the horizontal line would be a safer display area.

If the distance from the driver to the virtual image of a head-up display is short, when the driver is viewing the scenery ahead, there is perception of a HUD double image by the left and right eyes. This paper describes an indoor experiment carried out to analyze the relationship between the feeling of troublesomeness of the HUD and binocular vision. In the case of a HUD displayed to the right side from center, of the double image, it is clear that it more strongly receives the influence of the image by observation with the right eye. Conversely, in the case of a HUD displayed to the left side of center, of the double image, there is a stronger influence of the image received by observation with the left eye. This paper also involves analysis of the influence of the preferred eye on a feeling of troublesomeness.