The violation of any section or provision of the traffic code by means of a motor vehicle shall be prima facie evidence that the violation was committed by or with the authority or permission of the owner of the vehicle.
('73 Code, § 74.16)
§ 72.78 PERMITTING OR AUTHORIZING VIOLATION.
It shall be unlawful for any person being the owner or in charge of any vehicle to authorize or direct or permit another person to violate any section or provision of the traffic code by means of the vehicle.