Warning signs come in tow colors, and sizes. The signs regarding a potential risk is Yellow with black symbol or text, and triangle in shape. Mandatory signs denote required actions that contribute towards safety. They are circular and Blue with symbol or text in white.

There are four regulated safety sign elements that must be present in order meet OSHA standards for accident prevention signs. When creating safety signage for your facility it's important to include all four elements as a baseline for compliance.

Mandatory safety signs are used to show actions or behaviors that are to be implemented within a workplace or area of public access to comply with relevant health and safety regulations. They are considered the 'must do' of safety signs.