Visibility in lighted streets and the effect of the arrangement and light distribution of the lanterns.

This paper discusses the problem of assessing visibility in lighted streets and some inadequacies of existing lighting installations. Two investigations are reported: the first on the effect on brightness and "patchiness" of the spacing of lighting installations on roads of different widths. The second compares two cut-off and non-cut-off lighting installations in terms of visibility and glare.