Does OSHA require me to mark aisles with yellow paint?

Aisles and passageways must be appropriately marked but do not require marking by painted yellow lines only. Painted yellow lines are usually recognized as the most convenient and inexpensive way to mark aisles and passageways. Dirt floors or floors having continuous concentrations of sand or dust would render the application of painted floor markings infeasible and impractical.

Other appropriate methods include marking pillars, powder stripping, flags, traffic cones, and barrels. Many other devices are considered appropriate as long as recognition of such is included in the vehicle operator and employee training programs.