Samenvatting
A recent technical report on road-traffic-control signals prepared by the International Commission on Illumination is briefly discussed. The report represents a first step toward international standardisation of traffic signal lights in order to benefit trade and transportation. The principal subject areas of the technical report - colour, luminous intensity, and luminous intensity distribution - are outlined. It is concluded that the report can be highly beneficial to road traffic and that official recommendations should be prepared. (Author)