Each applicant for a taxicab driver's license shall be examined by the Chief of Police as to his knowledge of the laws of the City and upon his knowledge of the manner and method of driving and operating a motor vehicle. No person shall be given a taxicab driver's license unless such person:
(a) Shall be of the age of 18 years or over, and be of good moral character.
(b) Shall have no bodily or mental infirmities which render him unfit to safely operate a motor vehicle.
(c) Shall not be addicted to the use of intoxicating liquors or drugs.
(1969 Code 113.11)