Samenvatting
The use of a new type of retro-reflective material, high intensity grade, with regard to the perceptibility of traffic signs at night is studied. Four types of traffic signs were considered: signs provided with retro-reflective sheeting engineer grade and high intensity grade, signs that are externally illuminated and signs that are internally illuminated. Methods are presented which make a comparison between the detection and recognition distances of the different types of sign possible.