Section 902.124  Horns and Other Warning Devices

a)         No person shall sound a horn when upon a highway, except when reasonably necessary to insure safe operation.  No person shall sound any horn on any motor vehicle for an unreasonable period of time or in a manner so as to circumvent enforcement of the operational standards contained in this Subpart B.

b)         No person shall sound any siren, whistle or bell of any motor vehicle except as provided in Ill. Rev. Stat. 1981, ch. 95½, par. 12-601(b).