Assessing the Correlation Between Headlight Safety Performance Rating (HSPR) and the Visibility Level for varying Object Reflection Coefficients

This paper explores the correlation between the Headlight Safety Performance Rating (HSPR) and the Visibility Level (VL). HSPR, a well-established metric, assesses headlight distributions by integrating key lighting functions to provide a comprehensive evaluation of a headlight system's overall performance. This evaluation encompasses aspects such as beam width, illumination distance and adaptation to road curvature. Meanwhile, VL, a contrast threshold-based metric, incorporates factors like driver age, object dimensions, and background luminance, offering a quantitative measure of object detection capabilities. Employing a simulation-based approach, this study models headlight intensity distributions based on street surface reflection characteristics, using a grid of object positions in simplified scenarios. The analysis primarily focuses on the specific properties of light distributions, such as intensity and, notably, beam patterns, to determine their impact on the correlation between both metrics. This study incorporates a variation of reflection coefficients of grey card objects and their influence on the correlation.