{"data":{"id":"us/30-cfr-57.14132","jurisdiction":"us","citation":"30 CFR 57.14132","heading":"Horns and backup alarms for surface equipment.","body":"(a) Manually-operated horns or other audible warning devices provided on self-propelled mobile equipment as a safety device shall be maintained in a functional condition.\n(b)(1) When the operator has an obstructed view to the rear, self-propelled mobile equipment shall have—\n(i) An automatic reverse-activated signal alarm;\n(ii) A wheel-mounted bell alarm which sounds at least once for each three feet of reverse movement;\n(iii) A discriminating backup alarm that covers the area of obstructed view; or\n(iv) An observer to signal when it is safe to back up.\n(2) Alarms shall be audible above the surrounding noise level.\n(3) An automatic reverse-activated strobe light may be used at night in lieu of an audible reverse alarm.\n(c) This standard does not apply to rail equipment.","path":["Title 30—Mineral Resources","CHAPTER I—MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR","SUBCHAPTER K—METAL AND NONMETAL MINE SAFETY AND HEALTH","PART 57—SAFETY AND HEALTH STANDARDS—UNDERGROUND METAL AND NONMETAL MINES","Subpart M—Machinery and Equipment"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-30.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:25:24Z","sha256":"4d40b1c38e393c510e4dca7a1eedfd5ae285405c32b6f4a008812747bf1a7ce3","source_id":"us-cfr","stale":true,"prev":"us/30-cfr-57.14131","next":"us/30-cfr-57.14160"},"notice":"GroundRules: Original legal text. Not legal advice."}