When approved by the commission, a common carrier may give free or reduced rate transportation between points within this state to:
- (a) Its officers, agents, employees, and members of their families.
- (b) Indigent, destitute, and homeless persons, and to such persons when transported by charitable societies or hospitals, and the necessary agents employed in such transportation.
- (c) Persons injured in accidents or wrecks, and physicians and nurses attending such persons.