1. Any vehicle used for transporting heat-treated drinking milk and milk in small containers or in churns shall be so designed as to give the containers or churns adequate protection against all contamination and atmospheric influences. It shall be maintained in good condition and shall not be used to transport any animals of any species or any other product or object likely to cause the milk to deteriorate. Those parts of the vehicle intended to come into contact with the small containers or churns shall be smooth and easy to wash clean and disinfect.