Optimization technology of configuration for reflecting film in guide sign

The relationship between eyesight and the brightness ratio of word and background was analyzed, and the influences of colors' hue, saturation and brightness on colors' visibility were studied based on psychological theories.The influences of retro-reflective coefficient grades on visibility were researched based on field experiments, and the relation model between retro-reflective coefficient and visibility distance was established.Analysis result shows that there is a certain brightness ratio which can make the visibility best, and the visibility of white word on blue background is better than that of white word on green background.The best configuration of word and background for reflecting film is that the retro-reflective coefficient of word is 600 cd·lx^-1·m^-2, that of background is 92.5 cd·lx^-1·m^-2, and the corresponding visibility distance is 141.9 m.Analysis result indicates that the current grade of guide sign is higher and should be lowered.