Research on Color Barrier-Free Design of Subway Station Transfer Guidance Signage for People with Color Vision Deficiency

Objective Compared to people with normal color vision, people with color vision deficiency（hereinafter referred to CVD） experience difficulties in recognizing the guidance signage color information in subway station transfer navigation. To enhance subway station transfer pathfinding efficiency for people with CVD, it is necessary to analyze the color perception barriers of the subway station transfer guidance signage. Method First, by using a color vision simulator and Tobii Pro Glasses3 eye tracker, visual recognition experiments for people with CVD in subway station transfer navigation are conducted to summarize the above color perception barrier problems in transfer guidance signage. Then, based on subway station guidance signage design specifications and combined with eye movement tests, three color accessible design schemes for subway station transfer guidance signage are proposed, including the ambient illumination level adjustment of the guidance signage, the color blocks′ graphic shape of adjacent lines, and the fonts thickness of the adjacent subway lines. Then, taking the visual recognition time contrast ratio as an indicator, design standards of color accessible transfer guidance signage in subway stations are proposed in combination with the indicator levels under different schemes. Result ＆ Conclusion By generating multiple color accessible design comparison schemes for subway station transfer guidance signage, it is concluded that under a certain environmental illumination level of the transfer guidance signage, the color information visibility of subway station transfer guidance signage is the best with adjacent line′s right color block graphic adjusted to triangle and left fonts adjusted to bold. Compared with adjusting a single design element, the visual recognition time contrast is improved by 10.26%.