The Definition of Accident Prevention Signs and Tags

Definition of Accident Prevention Signs and Tags

Accident prevention signs and tags are standardized visual warnings that alert workers to hazards, give safety instructions and communicate the status of equipment. OSHA's general industry rule, 29 CFR 1910.145, defines the main sign categories and their colors: danger signs for immediate hazards, caution signs for potential hazards or unsafe practices, and safety instruction signs for general safety information. Tags are temporary devices attached to equipment to warn of a hazardous condition, such as a "Do Not Operate" tag on a switch. Construction sites follow the parallel rules in 29 CFR 1926.200.

Key Facts About Accident Prevention Signs and Tags

• Danger signs: red, black and white, used only where an immediate hazard exists.
• Caution signs: yellow background with a black panel, used for potential hazards or to warn against unsafe practices.
• Safety instruction signs: white with a green panel, used for general instructions such as first aid locations.
• OSHA accepts signs designed to current ANSI Z535 standards as an alternative to the older designs in its rules.
• Tags must be legible, durable for the environment, and state the hazard and the required action.

Example of Accident Prevention Signs and Tags

A maintenance team hangs a "DANGER: Do Not Operate" tag on a pump's control switch while waiting for a replacement seal, and places a yellow caution sign at the entrance to a walkway with a temporarily uneven floor. Both are removed only after the conditions are corrected.

How to Use Safety Signs and Tags Effectively

1. Match the signal word to the severity of the hazard and don't overuse "Danger."
2. Place signs where people see them before they reach the hazard.
3. Keep wording short and specific about the hazard and the action required.
4. Inspect signs and tags during routine workplace inspections and replace damaged or outdated ones.
5. Remove signs and tags once the hazard is gone so warnings stay credible.

Related Terms

• Lockout/Tagout (LOTO)
• Yellow Safety Color
• Hazard Communication (HazCom)
• Barricade

Frequently Asked Questions: Accident Prevention Signs and Tags

What is the difference between a danger sign and a caution sign?

A danger sign marks an immediate hazard that will cause death or serious injury if not avoided, while a caution sign marks a potential hazard or unsafe practice that could cause injury. Using the right word keeps workers from tuning out warnings.

Are ANSI Z535 signs OSHA compliant?

Yes. OSHA updated its sign rules to recognize designs that meet current ANSI Z535 standards, which add pictograms and more detailed safety messages, as an acceptable alternative.

Can a tag be used instead of a lock during lockout/tagout?

Only when an energy-isolating device cannot accept a lock, or when the employer can show a tagout program gives protection equivalent to lockout under 29 CFR 1910.147. Otherwise a lock is required, and a tag alone is not enough.