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The authors have carried out two types of tests regarding head-up displays (HUDs) for the purpose of determining the relationship between display position and a feeling of troublesomeness for the driver. The first test was a basic experiment to evaluate how troublesome the HUDs were to an observer sitting in a chair outdoors. The collected data was used as the basis for carrying out approximation by means of two-dimensional normal distribution. In the second test, the observer was actually in a car and a mock-up HUD making use of clear film was used to carry out the experiment in investigating how the feeling of troublesomeness changed depending on whether the vehicle was in a stop state or in a moving state. Compared to a stop state, the results in a driving state showed a shift toward the left side for the distribution of a feeling of troublesomeness. The reason is probably because the distribution of the line of vision of the driver moves toward the left when driving in Japan.

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.