General Industry (29 CFR 1910)

Specifications for Accident Prevention Signs and Tags

Verified vs OSHA sources · 2026-10-05

29 CFR 1910.145

29 CFR 1910.145 standardizes the design and use of workplace safety signs and tags so their color and signal word carry a consistent meaning: DANGER signs (red) for immediate hazards, CAUTION signs (yellow) for potential hazards, safety-instruction signs for general guidance, and accident-prevention tags for temporary hazards such as out-of-service equipment.

29 CFR 1910.145 at a glance

What it requires: Standardized design and use of safety signs and tags to warn of workplace hazards
Who it covers: General-industry employers using signs or tags to warn of hazards
Sign categories: DANGER (red, immediate hazard), CAUTION (yellow, potential hazard), and safety-instruction signs
Tags: Accident-prevention tags warn of temporary hazards (e.g., out-of-service equipment)
Max penalty (2026): $16,550 per serious violation; $165,514 per willful
The #1 confusion: DANGER and CAUTION are not interchangeable: each has a defined meaning and color

What 29 CFR 1910.145 requires (plain English)

29 CFR 1910.145 specifies how accident-prevention signs and tags must be designed and used to warn workers of hazards. It standardizes the visual language of workplace safety so that a sign's color and signal word carry a consistent meaning across every workplace: employees must be instructed that danger signs indicate immediate danger and that special precautions are necessary.

The standard defines three main sign categories by signal word and color. DANGER signs (red) are used only where an immediate hazard exists and serious injury or death is possible. CAUTION signs (yellow) warn against potential hazards or unsafe practices. Safety-instruction signs (typically green) convey general safety information and instructions. Biological-hazard signs carry the standardized biohazard symbol. Design rules cover legibility, rounded corners, and wording that is concise and easy to read.

Separately, 1910.145 governs accident-prevention tags: temporary warnings attached to equipment or an area to signal a hazard such as a defective tool or out-of-service machine, including the tags used within lockout/tagout. Signs and tags complement, but do not replace, the physical controls for a hazard: a tag on a broken machine warns, but the machine still must be repaired or removed from service. 1910.145 works alongside the safety color code (1910.144) and the tag provisions in lockout/tagout (1910.147).

The regulatory text

“All employees shall be instructed that danger signs indicate immediate danger and that special precautions are necessary.”

29 CFR 1910.145(c)(1)(ii)

Key facts about 29 CFR 1910.145

DANGER signs (red) are used only where an immediate hazard exists (1910.145(c)(1)).
CAUTION signs (yellow) warn against potential hazards or unsafe practices (1910.145(c)(2)).
Safety-instruction signs convey general safety information and instructions (1910.145(c)(3)).
Employees must be instructed that danger signs indicate immediate danger (1910.145(c)(1)(ii)).
Accident-prevention tags warn of temporary hazards such as defective or out-of-service equipment (1910.145(f)).
The biological-hazard sign uses the standardized biohazard symbol (1910.145(e)(4)).
1910.145 works with the safety color code (1910.144) and lockout/tagout tags (1910.147).

Scope: who 29 CFR 1910.145 applies to

Regulatory framework: General Industry (29 CFR 1910)
Citation reference: 29 CFR 1910.145
Enforcement status: In force and enforced
Jurisdiction: Federal OSHA (29 State-Plan jurisdictions may be stricter)

State-Plan states (e.g. California, Washington, Michigan) operate OSHA-approved programs that must be at least as effective as federal OSHA and frequently impose higher penalties or additional requirements. Confirm the rule as adopted in your state.

Key requirements of 29 CFR 1910.145

#	Employer obligation
1	Use DANGER signs for immediate hazards
2	Use CAUTION signs for potential hazards
3	Use SAFETY INSTRUCTION signs for general directions
4	Tags must warn of specific temporary hazards
5	Maintain signs in readable condition

Summarized from the text of 29 CFR 1910.145. Always read the full regulation for the binding language.

Common Safety Signs & Tags violations

Deficiencies OSHA cites under 29 CFR 1910.145 include the ones below, in no particular order. Distinct deficiencies can be cited as separate items, and each serious item carries up to $16,550 (2026). Broader per-instance stacking exists but is a discretionary, case-by-case OSHA enforcement policy, not an automatic multiplier.

Using a CAUTION sign where an immediate hazard requires a DANGER sign (1910.145(c)).
Signs that do not meet the design, wording, or legibility requirements (1910.145(d)).
Missing accident-prevention tags on defective or out-of-service equipment (1910.145(f)).
Employees not instructed on the meaning of danger signs (1910.145(c)(1)(ii)).
Non-standard biological-hazard signage where a biohazard exists (1910.145(e)(4)).

DANGER and CAUTION mean different things: they are not interchangeable

Signs are a language, and using the wrong word undercuts the warning. Under 1910.145, a DANGER sign (red) is reserved for an immediate hazard where serious injury or death is possible, while a CAUTION sign (yellow) warns of a potential hazard or an unsafe practice that is less severe. Posting CAUTION on a lethal hazard understates it, and overusing DANGER dilutes its urgency. A related distinction: 1910.145 signs and tags warn of a hazard but do not control it (a tag on an out-of-service machine is a warning, not a substitute for repair or lockout) and the tags used in lockout/tagout are governed together with 1910.147.

What OSHA inspectors look for

A compliance officer checks that signs use the correct signal word and color for the hazard severity, that they meet the design and legibility requirements, that biohazard signage uses the standard symbol, and that accident-prevention tags mark temporary hazards. Using CAUTION where an immediate hazard needs DANGER is a common finding.

Example: how a violation is cited

A facility posts a yellow CAUTION sign on a high-voltage enclosure that presents an immediate electrocution hazard. OSHA cites 1910.145(c) because a DANGER sign was required for an immediate hazard: an understated warning, with penalties from $16,550.

Illustrative example, not a specific OSHA case.

Safety Signs & Tags compliance checklist

Use this to evaluate your compliance with 29 CFR 1910.145. Each item is a key requirement OSHA may verify during an inspection.

Use DANGER signs only for immediate hazards, and CAUTION signs for potential hazards or unsafe practices.
Ensure signs meet the design, color, wording, and legibility requirements of the standard.
Instruct employees that danger signs indicate immediate danger requiring special precautions.
Apply accident-prevention tags to temporary hazards such as defective or out-of-service equipment.
Use the standardized biohazard symbol where a biological hazard is present.
Remember signs and tags warn of a hazard but do not replace the physical control or repair.

2026 penalties for 29 CFR 1910.145

Maximums set by 29 CFR 1903.15(d). 2026 amounts unchanged from 2025 (no CPI adjustment; OMB M-26-11). Not an increase. The 2025 OSHA penalty levels remain in effect for 2026; OSHA made no inflation adjustment for 2026. 29 CFR 1903.15 identifies January 15, 2025 as the effective reference for these amounts, while OSHA's public penalties page currently references penalties assessed after Jan. 15, 2026.

Violation type	Minimum	Maximum	When it applies
Serious	$1,085	$16,550	Substantial probability of death or serious physical harm.
Other-Than-Serious	$0	$16,550	Relates to safety/health but unlikely to cause death or serious harm.
Willful	$11,823	$165,514	Intentional, knowing, or voluntary disregard of the requirement.
Repeated	$4,256	$165,514	A substantially similar violation cited within the last 5 years.
Failure to Abate	None	$16,550/day	up to $16,550 per day; total capped at 30x the daily amount (FOM Ch.6)

Sign and tag citations arise during general walkthroughs. Serious violations reach $16,550 and willful or repeat violations $165,514; wrong signal words and missing accident-prevention tags are the usual findings.

Maximums and the willful minimum are set by 29 CFR 1903.15(d); the serious and repeated minimums are OSHA policy floors from its annual penalty adjustment memo. OSHA applies gravity-based and size, good-faith and history reductions (FOM CPL 02-00-164 Ch.6). Estimates only, not legal advice.

The business case for Safety Signs & Tags compliance

Safety signs are a visual language, and using the wrong word undercuts the warning: CAUTION on a lethal hazard understates it, while overusing DANGER dilutes its urgency. Consistent, standardized signage lets a worker instantly gauge how serious a hazard is, but a sign warns, it does not control the hazard.

Free compliance tools for 29 CFR 1910.145

Weekly Site Safety Inspection Secondary Container Label Maker

Safety Signs & Tags penalties by state

Penalties and enforcement vary by state. State-Plan states may impose higher penalties and additional requirements beyond federal 29 CFR 1910.145.

Alabama Arkansas Colorado Connecticut Delaware District of Columbia

View all 50 states + DC →

Frequently asked questions about 29 CFR 1910.145

What is the difference between a DANGER and a CAUTION sign?

Under 1910.145, a DANGER sign (red) is used only where an immediate hazard exists and serious injury or death is possible, while a CAUTION sign (yellow) warns against potential hazards or unsafe practices that are less severe. The two are not interchangeable: using CAUTION on a lethal hazard understates the danger, and overusing DANGER dilutes its urgency.

What are the categories of safety signs under OSHA?

1910.145 defines three main categories by signal word and color: DANGER signs (red) for immediate hazards, CAUTION signs (yellow) for potential hazards or unsafe practices, and safety-instruction signs (typically green) for general safety information and instructions. The standard also covers biological-hazard signs using the standardized biohazard symbol and accident-prevention tags for temporary hazards.

What are accident-prevention tags used for?

Accident-prevention tags are temporary warnings attached to equipment or an area to signal a hazard: such as a defective tool, an out-of-service machine, or a de-energized circuit. Under 1910.145(f), they warn workers of the specific temporary hazard, including the tags used in lockout/tagout. A tag warns of the hazard but does not control it; the underlying condition still must be repaired or locked out.

Do OSHA signs have to follow a specific design?

Yes. 1910.145 sets design requirements for signs and tags (including signal words, colors, legibility, rounded corners, and concise wording) so their meaning is consistent across workplaces. Since a 2013 update, OSHA also recognizes the more recent ANSI Z535 series of sign and tag standards as an acceptable alternative, giving employers flexibility to use modern signage formats while preserving consistent hazard messaging.

Regulatory history of 29 CFR 1910.145

1910.145 was adopted at OSHA's inception in 1971 from national consensus standards (the ANSI Z35 sign series and Z53 color code). OSHA updated the standard in 2013 to recognize the more recent ANSI Z535 series of sign and tag standards as an acceptable alternative, giving employers flexibility to use modern signage formats.

Related glossary terms

Key terms that appear in 29 CFR 1910.145, each with a full plain-English explainer.

LOTO (Lockout/Tagout)Hazardous Energy Personal Protective Equipment (PPE)

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Primary sources

OSHA figures on this page are imported from HazComFast's verified regulatory module (verified 2026-10-05 against eCFR, OSHA.gov, and the Federal Register).

This page is an educational summary, not legal advice. OSHA standards and penalty amounts change; confirm requirements against the current regulation and your applicable State-Plan before acting.

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