The problems associated with vehicle rear lighting are analysed and discussed in terms of the functional and physical factors involved, and the requirements of a rear lighting system are listed. The results of a survey of existing rear lamps are presented. A computer simulation model based on an adaptive matrix is described. Initial results from a number of subjective tests with specially instrumented vehicles are reported. Salient findings from previously performed subjective tests on summation of luminous areas, adaptation luminance and visibility of light sources in foci are also given. A procedure is described for the semi-automatic determination of "effective projected luminous area"of rear lamps. On the basis of present knowledge, some tentative proposals are made for an improved rear lighting system.
Abstract