An analysis of visual elements in roadway lighting

VISUAL elements which are fundamental to roadway- lighting need to be clarified. The many varying elements of night visibility form a complex interrelationship which is not generally understood. Further studies and investigations are being carried on to obtain more quantitative data on such visual elements as discomfort glare, veiling glare, and pavement and object reflectance characteristics. Also, practical methods and means for measurements are currently being developed. However, until all this becomes a reality, we must utilize established facts and proven experience.