Samenvatting
Considerable basic psycho physiological research has been reported concerning the measurement of visibility and its relationship to illumination. The problem with this approach to establishing criteria is that additional illumination will usually improve contrast and, therefore, visibility will be increased. What is missing is information on the effect of visibility on driver behavior: i.e., how much visibility is required for the driver to perform in a satisfactory manner? It is to this question that the research is addressed.