Double duty

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Advertising boards on the platforms of Seoul subway stations are being turned into doors that can be opened to allow emergency access to subway tracks. The Seoul Metro will turn about 14,000 advertising boards in 132 stations into emergency doors by the end of the year. [YONHAP]
Advertising boards on the platforms of Seoul subway stations are being turned into doors that can be opened to allow emergency access to subway tracks. The Seoul Metro will turn about 14,000 advertising boards in 132 stations into emergency doors by the end of the year.