A taxicab may not be operated until a permit has been obtained from the Public Service Commission for the authorized jurisdiction in accordance with Public Utilities Article, §10-202, Annotated Code of Maryland. Permits may not be transferred without the consent of the Public Service Commission. A charge will not be made for the issuance of any permit. When the taxicab is on duty, the holder of a permit is required to operate the taxicab the permit identifies in such manner as to render maximum service to the public, in conformity with Commission regulations. A taxicab may not be kept idle while there is a demand for service. The holder of a taxicab permit that has not recorded a minimum of 12,000 miles of operation per calendar year may be required to show good cause for the apparent lack of usage, or be subject to revocation of the permit. A permit holder shall notify the Public Service Commission within 72 hours of any change of address.