(1)A licensing authority must issue a person with a certificate exempting the person from the duties imposed by section 165 (an “exemption certificate”) if satisfied that it is appropriate to do so—
(a)on medical grounds, or
(b)on the ground that the person's physical condition makes it impossible or unreasonably difficult for the person to comply with those duties.
(2)An exemption certificate is valid for such period as is specified in the certificate.
(3)The driver of a designated taxi is exempt from the duties imposed by section 165 if—
(a)an exemption certificate issued to the driver is in force, and
(b)the prescribed notice of the exemption is exhibited on the taxi in the prescribed manner.
(4)The driver of a designated private hire vehicle is exempt from the duties imposed by section 165 if—
(a)an exemption certificate issued to the driver is in force, and
(b)the prescribed notice of the exemption is exhibited on the vehicle in the prescribed manner.
(5)For the purposes of this section, a taxi or private hire vehicle is “designated” if it appears on a list maintained under section 167.
(6)In this section and section 167 “licensing authority”, in relation to any area, means the authority responsible for licensing taxis or, as the case may be, private hire vehicles in that area.