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OSHA regulations state that permanent aisles and passageways must be marked (1910.176(a)). OSHA also explains that one way employers can provide safe access and egress to and from walking-working surfaces per 1910.22(c) is by “appropriately marking” passageways and permanent aisles as a means of identifying safe access and egress. Neither regulation defines how aisle marking should be done.
A common method for marking is by using yellow paint or stripes. OSHA designates yellow as the “caution” color, to be used for marking physical hazards, such as stumbling, falling, or tripping (1910.144(a)(3)). ANSI Z535.1, Safety Color Code, also defines “safety yellow” as the identification of caution. ANSI recommends the use of solid yellow, yellow and black stripes, or yellow and black checkers for maximum contrast with the particular background, and it designates combinations of black and yellow as the preferred method for traffic markings. Other appropriate aisle-marking methods include marking pillars, powder stripping, flags, traffic cones, barrels and other devices as long as recognition of such is included in the vehicle operator and employee training programs.