[G.O. No. 1111, § 1]
For the purposes of this chapter, the following words and phrases shall have the meanings respectively ascribed to them by this section:
A device having two wheels, with tires 20 inches or more in diameter, connected by a frame, and designed and intended to be propelled by human power. This definition shall not apply to toy bicycles or to velocipedes.
Such member of the Police Department as shall be designated by the Chief of Police as such safety officer.