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The human factors benefits of the Head Up Display (HUD) for automobile applications are improved visibility, and prevention of view-obstruction when collecting driving information. We evaluated several HUD's considering such factors as location (in-plane location and distance), character size, brightness and color through investigations of view-point distribution, measurement of recognition time and subjective evaluation. The results made clear an appropriate range for each factor. It was also confirmed that the HUD recognition time is significantly shorter than that of the conventional instrument panel display by more than 0.1 second.
Inuzuka et al. (Sun,) studied this question.