Under current standards, the visibility evaluation of road objects by road lighting, inverse silhouette view is not considered. In addition, it is actually difficult to measure the performance index indicating the visibility of the installed road lighting. LED is widely used as an illumination source, instruments having various light distribution has been developed. However, as traffic safety facilities, and both the overall visibility and energy-saving lighting equipment, it is necessary to develop techniques to measure easily and accurately the road surface luminance. In this paper on these issues, from the point of view of "theory" and "measurement technology", I will introduce the latest technology that is research and development towards the current practical use.
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