- Yellow. – Yellow shall be the basic color for designating caution and for marking physical hazards such as: Striking against, stumbling, falling, tripping, and “caught in between.”
- “DANGER” – Red, or predominantly red, with lettering or symbols in a contrasting color.
- “CAUTION” – Yellow, or predominantly yellow, with lettering or symbols in a contrasting color.
- “WARNING” – Orange, or predominantly orange, with lettering or symbols in a contrasting color.
- “BIOLOGICAL HAZARD” – Fluorescent orange or orange-red, or predominantly so, with lettering or symbols in a contrasting color.