30 C.F.R. § 57.14200 Warnings prior to starting or moving equipment.
Title 30 - Mineral Resources
Before starting crushers or moving self-propelled mobile equipment, equipment operators shall sound a warning that is audible above the surrounding noise level or use other effective means to warn all persons who could be exposed to a hazard from the equipment.
Title 30: Mineral Resources
PART 57—SAFETY AND HEALTH STANDARDS—UNDERGROUND METAL AND NONMETAL MINES
Subpart M—Machinery and Equipment
Safety Practices and Operational Procedures
§ 57.14200 Warnings prior to starting or moving equipment.

