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According to the Handling Materials — General Standard at 1910.176, where mechanical handling equipment is used ... permanent aisles and passageways shall be appropriately marked. Also, effective January 17, 2017, OSHA requires that the employer provide, and ensure each employee uses, a safe means of access and egress to and from walking-working surfaces, per 1910.22(c). OSHA explains that one way employers can meet paragraph (c) is by “appropriately marking” passageways and permanent aisles as a means of identifying safe access and egress.
OSHA designates yellow as the “caution” color, to be used for marking physical hazards, such as stumbling, falling, or tripping (1910.144(a)(3)). The American National Standards Institute (ANSI) Z535.1-1998, Safety Color Code, recommends black, white, yellow, or a combination of black and yellow for traffic markings. Note: ANSI Z535.1-2002, Safety Color Code, and later editions no longer have safety color meanings, which appeared in the 1998 and earlier editions.