20.—(1) The holder of an instructor’s licence shall, when he is acting as a driving instructor, wear the licence over the left chest in such manner that the particulars endorsed thereon are clearly exposed to view and shall produce it to the Deputy Commissioner of Police or a police officer for inspection on demand.
(2) Paragraph (1) shall not apply to a licence which has been lost, destroyed, defaced or obliterated where the licensee has applied for a duplicate under rule 29.