For the purposes of this article, the following words and phrases shall have the meanings, respectively, ascribed to them by this section:
The driving of an empty taxicab to and fro along a public street at a slow rate of speed for the obvious purpose of soliciting passengers.
A public vehicle driven by mechanical power, so designed and constructed as to comfortably seat not fewer than three persons inside thereof, exclusive of the driver, which accommodates passengers for conveyance for hire.
A section of a public street or public place set apart for the exclusive use of a limited number of taxicabs, when such section is distinctly marked as such by a metal sign attached to a stanchion on the curb or other conspicuous place or by clearly visible marks upon the surface of the street or public place.
A mechanical instrument or device by which the charge for hire is mechanically calculated either for the distance traveled or for waiting time, or both, and upon which such charge shall be plainly indicated by means of figures.