MSHA - Code of Federal Regulations - 30 CFR 57.11051
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MSHA - Title 30 CFR
30 CFR § 57.11051
Escape routes.
Escape routes shall be--

(a) Inspected at regular intervals and maintained in safe, travelable condition; and
(b) Marked with conspicuous and easily read direction signs that clearly indicate the ways of escape.