For the purposes of this chapter, the following words and phrases shall have the meanings respectively ascribed to them by this section:
A certificate of convenience and necessity issued or authorized to be issued by the City Council, which authorizes the person to whom issued to operate one or more public vehicles pursuant to this chapter.
Any person driving a public vehicle.
Any person having control of the employment, use or maintenance of a public vehicle or of the collection of revenue derived from its operation.
Any motor vehicle used for the transportation for hire or reward of passengers upon the streets of the City, other than buses being operated under franchise and over fixed routes between fixed termini and other than vehicles being operated in interstate commerce.