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This paper analyzes the subjective evaluation of the lighting of the auxiliary lamps of a motorcycle on the basis of the data collected in field experiments. Two types of experiments were conducted: 1) To investigate the effect of various positions of the auxiliary lamps on a motorcycle, and 2) To determine the influence of various luminous intensities of the lamps. For example, the subjects were instructed to judge how they felt about the appropriateness of the auxiliary lamps according to the 5-interval integer rating scale. After the tests, the authors made non-linear interpolations of the data by means of three-layered neural networks. This analysis presents considerable information about the appropriateness of the auxiliary lamps in regards to their positions on the motorcycle and their luminous intensities in daytime and nighttime conditions respectively.

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.