Section 20.06 - Conveyances and Transporting Vehicles(1) Vehicles used to transport Guard Dogs shall be mechanically sound, maintained and equipped to provide fresh air and the control of temperature extremes to all animals being transported.(2) All enclosures shall be large enough to ensure that each animal contained therein has sufficient space to turn freely in a standing position, insuring natural ability to stand, to sit erect, and to lie in a natural position.(3) Each vehicle shall display the words "CAUTION-GUARD DOGS" on the rear and on each side, in letters at least six inches high.(4) Each vehicle shall display the name and full address or name and telephone number o f the Licensee.(5) Vehicles containing Guard Dogs shall not be left unattended on a public way for more than 15 minutes. The Handler or Driver shall make certain that the animals are secured from release by unauthorized persons before leaving the vehicle.