(c) A motor vehicle operator shall use a horn to provide audible warning only when necessary to insure safe operation. (d) A warning device, including a horn, may not emit an unreasonably loud or harsh sound or a whistle. Acts 1995, 74th Leg., ch. 165, Sec. 1, eff. Sept. 1, 1995. Sec. 547.502. VISIBLE WARNING DEVICES REQUIRED.
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