MSHA - Code of Federal Regulations - 30 CFR 57.11012
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MSHA - Title 30 CFR
30 CFR § 57.11012
Protection for openings around travelways.
Openings above, below, or near travelways through which persons or materials may fall shall be protected by railings, barriers, or covers. Where it is impractical to install such protective devices, adequate warning signals shall be installed.