30 CFR 56.14132 - Horns and backup alarms.
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(a) Manually-operated horns or other audible warning devices provided on self-propelled mobile equipment as a safety feature shall be maintained in functional condition.
(1) When the operator has an obstructed view to the rear, self-propelled mobile equipment shall have—
(3) An automatic reverse-activated strobe light may be used at night in lieu of an audible reverse alarm.
Title 30 published on 2013-07-01
no entries appear in the Federal Register after this date.