(a) Upon all heavily traveled thoroughfares it shall be the duty of all persons operating bicycles to ride in single file. (1979 Code 75.12)
(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.