MSHA - Code of Federal Regulations - 30 CFR 75.384
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MSHA - Title 30 CFR
30 CFR § 75.384
Longwall and shortwall travelways.

(a) If longwall or shortwall mining systems are used and the two designated escapeways required by §75.380 are located on the headgate side of the longwall or shortwall, a travelway shall be provided on the tailgate side of that longwall or shortwall. The travelway shall be located to follow the most direct and safe practical route to a designated escapeway.
(b) The route of travel shall be clearly marked.
(c) When a roof fall or other blockage occurs that prevents travel in the travelway--
(1) Work shall cease on the longwall or shortwall face;
(2) Miners shall be withdrawn from face areas to a safe area outby the section loading point; and
(3) MSHA shall be notified.
(d) Work may resume on the longwall or shortwall face after the procedures set out in §§75.215 and 75.222 are implemented.