MSHA - Code of Federal Regulations - 30 CFR 56.20011
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MSHA - Title 30 CFR
30 CFR § 56.20011
Barricades and warning signs.
Areas where health or safety hazards exist that are not immediately obvious to employees shall be barricaded, or warning signs shall be posted at all approaches. Warning signs shall be readily visible, legible, and display the nature of the hazard and any protective action required.