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Use of Horns

27001.  (a) The driver of a motor vehicle when reasonably necessary to insure safe operation shall give audible warning with his horn.

(b) The horn shall not otherwise be used, except as a theft alarm system which operates as specified in Article 13 (commencing with Section 28085) of this chapter.

Amended Ch. 993, Stats. 1977. Effective January 1, 1978.