![]() ![]() This is due to obvious reasons, such as decreased conspicuity of road hazards or pedestrians, but also due to physical and cognitive limitations of human perception and performance. At nighttime and in situations of low levels of illumination, our ability to perform optimally may be severely impaired. Our visual system is optimized for daytime activities, because it is most sensitive to high contrast objects, defined by differences in motion, color, size, etc. We have published on issues relating to human perception and performance under a variety of lighting conditions, ranging from the ability of drivers to perceive potential hazards to the influence of moon phase on visibility.
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