The certificate holder shall insure that the taxicab is inspected at a duly licensed Maryland state inspection station, at least twice during a twelve (12) month period. An inspection shall be performed not more than six (6) months from the previous inspection. On an annual basis and as scheduled during the year, the Director shall inspect the condition and general maintenance of all taxicabs for conformance with the requirements of this Subtitle. If a taxicab is found to be unclean or unfit at any time, but otherwise in safe condition, the Director may give the driver and certificate holder a reasonable time to remedy the condition, after which the Director shall reinspect the vehicle. Violations of cleanliness or maintenance requirements or failure to submit vehicle for inspection or reinspection shall be cause for suspension or revocation of the certificate. An accessible taxi found to be unfit must be repaired within ten days of failing an inspection. Failure to submit the vehicle for inspection or reinspection, or operation of the vehicle in violation of this provision shall be cause for suspension or revocation of the certificate. The certificate holder shall ensure that every taxicab satisfactorily passes an emissions control test administered by the State of Maryland or an authorized test station on a biennial basis.