Free Standard Shipping on Orders $100+! Stock up on essential safety signs & regulatory signage today. Shop now!

Decoding the Language of Danger, Warning, and Caution

Warehouse safety graphic with bold signal words “Danger,” “Warning,” and “Caution” in red, orange, and yellow blocks under the heading “Understanding Core Signal Words

Brandon Richards |

Why ‘Sign’ Language Matters in Safety

In safety communication, every word matters—especially when it’s printed in bold letters on a wall, machine, or doorway. Yet many workplaces misunderstand or misuse the core signal words that OSHA and ANSI define: Danger, Warning, and Caution.

These words aren’t interchangeable—they carry specific meanings tied to the severity and likelihood of a hazard. Misapplying them can lead to confusion, underreaction, or even noncompliance. Whether you’re managing a jobsite, warehouse, or facility, getting these words right is essential to protecting your people and your business.

Let’s break down what each signal word means, when to use them, and how to apply them correctly across your workplace.

The OSHA/ANSI Hierarchy of Hazard Severity

The signal words Danger, Warning, and Caution are defined in two key places:

  • OSHA 1910.145: U.S. standard for accident prevention signs
  • ANSI Z535.2: Voluntary standard that adds clarity, format guidance, and consistency

Each word represents a different level of hazard severity and dictates how urgently a worker should respond:

  • Danger: Imminent hazard that will cause serious injury or death if not avoided. It’s the highest level of urgency.
  • Warning: Hazards that could result in serious injury or death, but not immediately.
  • Caution: Hazards that may cause minor or moderate injury or property damage.

Using the right signal word sets expectations for action. It communicates the probability, proximity, and severity of a hazard—instantly and without interpretation.

Comparison Chart

Pro tip: OSHA requires Danger and Caution signage, while Warning is recommended by ANSI. All three can and should be used together based on the severity of risks in each zone.

Real-World Examples by Workplace Zone

Construction Site

Manufacturing Plant

Warehouse or Logistics

Why Getting It Right Matters

Pick the wrong signal word and you're not just making a design mistake—you're setting yourself up for legal trouble.

  • Use "Danger" too often, and workers tune it out.
  • Use "Caution" when "Danger" is required and someone may get hurt—triggering OSHA penalties.
  • In an incident, your signage will be scrutinized—mislabeling can hurt inspections, claims, and audits.

When your signal words match the actual risks, workers trust your signage. They'll know exactly what's at stake and how fast they need to move.

MaxSafety.com Recommendations

  1. Conduct a Signage Audit: Review current signage for accuracy and placement.
  2. Use Hazard Assessments: Align signage language with documented risks (e.g., JHAs).
  3. Match Color, Format, and Symbol: Follow ANSI Z535 for consistency and legibility.
  4. Educate Your Team: Ensure workers understand the meaning behind each signal word.

Pro Tip: Ask team members to explain what each signal word means to them—this checks for understanding and highlights training gaps.

Get the Message Right Before It’s Too Late

Danger, Warning, and Caution aren't just design choices—they’re vital safety tools. Use them accurately and consistently to improve workplace safety and reduce liability.

Need help? MaxSafety.com offers signage audits and tools to ensure your signs are compliant and effective. Connect with our team today.

Works Cited

About the Writer

Brandon Richards has first-hand experience conducting OSHA training sessions and performing OSHA tests for manufacturing and logistics companies in the U.S. As a workplace and compliance specialist, he takes pride in helping keep visitors, employees, and employers as safe as possible.

We’ve put together The Safety Blueprint to support your safety efforts, but compliance rules can vary. For the best results, consult with industry professionals or local regulators.

Read More