A RESEARCH TO NOTICEABILITY OF SIGNBOARD ON DRIVING SITUATION USING DRIVING SIMULATOR -The basic investigation using real signboard-:−The basic investigation using real signboard−

The main objective of this study is to investigate the factors which affect the roadside signboard cognition during driving. As for the experimental subject to this research, 10 kinds of signboards of suburban roadside shops were studied. The three visible distance of signboards in driving simulator were measured; detectable distance, confirmable distance and legible distance. Also, solid angle and visible angle were analyzed. The effect of color, size, placement of signboard and the difference of luminosity between signboard and its background were shown. The difference of luminosity can be considered when signboard is detected, confirmed and distinguished. Also, wide board placed closer to the road is effective at confirming.