(1) The Commissioner may at any time revoke a driver's licence or a conductor's licence upon the application of the holder thereof.
(2) The Commissioner may at any time on his own motion revoke or suspend for such period as he shall think proper a driver's licence where he is satisfied that the holder of such licence has ceased to hold a driving licence which is for the time being in force or has ceased to be a fit and proper person to hold a driver's licence.
(3) The Commissioner may at any time on his own motion revoke or suspend for such period as he shall think proper a conductor's licence where he is satisfied that the holder of such licence has ceased to be a fit and proper person to be the conductor of a large public service vehicle.
(4) Whenever the Commissioner revokes (otherwise than on the application of the holder of the licence) or suspends a driver's licence or a conductor's licence, the person who was the holder of such licence immediately before such revocation or