The study considers visual distances when drivers on motorway are subject to glare from car headlights. A mathematical model which allows the calculation of visual distances under glare from oncoming vehicles has been developed and tested. A detailed description of this part of the study is given in English. Some practical effects of this study on Danish design standards are outlined. Visual distances are calculated for different widths of the central reserve on tangent sections of a motorway and for two typical examples of horizontal reversed curvature with a 12 m central reserve. It is concluded that even when the central reserve is 12 m, oncoming vehicles must use dipped headlights at least in curves unless some kind of a glare fence is set up on the central reserve.
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