MSHA - Code of Federal Regulations - 30 CFR 77.205
30 CFR § 77.205
Travelways at surface installations.
(a) Safe means of access shall be provided and maintained to all
working places.
(b) Travelways and platforms or other means of access to areas where
persons are required to travel or work, shall be kept clear of all
extraneous material and other stumbling or slipping hazards.
(c) Inclined travelways shall be constructed of nonskid material or
equipped with cleats.
(d) Regularly used travelways shall be sanded, salted, or cleared of
snow and ice as soon as practicable.
(e) Crossovers, elevated walkways, elevated ramps, and stairways
shall be of substantial construction, provided with handrails, and maintained
in good condition. Where necessary toeboards shall be provided.
(f) Crossovers shall be provided where it is necessary to cross
conveyors.
(g) Moving conveyors shall be crossed only at designated crossover
points.