Where mechanical handling equipment is used, sufficient safe clearances must be provided and aisles/passageways must be maintained in good condition. Even outdoor yards, storage areas, and passageways must be maintained. For example, large potholes could overturn a lift truck.
30 CFR § 56.9101 Operating speeds and control of equipment.
30 CFR § 56.9313 Roadway maintenance.
30 CFR § 56.11001 Safe access.
30 CFR § 56.20003 Housekeeping.
30 CFR § 77.205 Travelways at surface installations.
30 CFR § 77.1607 Loading and haulage equipment; operation. [see subsection (c)]