OSHA does not require floor markings to indicate exits or ways of exit access. If an employer chooses to install exit route floor markings, the American National Standards Institute (ANSI) Z535.1-1998, “Safety Color Code,” recommends the color green to indicate evacuation routes. In contrast, the standard recommends black, white, yellow, or a combination of black and yellow for housekeeping markings.
Note: ANSI Z535.1-2002, “Safety Color Code,” and later editions no longer indicate safety color meanings, which only appeared in the 1998 and earlier editions.