(a) No bicycle rider shall suddenly stop, slow down or turn without giving the arm signal required by Section 331.15.
(1979 Code 75.11)
(b) Whoever violates any provision of this section is guilty of a minor misdemeanor on a first offense; on a second offense within one year after the first offense, the person is guilty of a misdemeanor of the fourth degree; on each subsequent offense within one year after the first offense, the person is guilty of a misdemeanor of the third degree.