(a) No owner or other person having possession or control of any taxicab shall operate the same upon the streets unless such vehicle has an unexpired seal of inspection indicating that it has been duly inspected and found safe and roadworthy within the preceding six months.
(b) If any such taxicab is damaged by reason of a collision or from any other cause, no owner or person having possession or control thereof shall operate the vehicle upon the streets unless such vehicle has been tested and approved at an authorized inspection station within twenty-four hours after such vehicle has been returned to service.
(c) A violation of this section shall constitute grounds for revocation of such taxicab license.