7. Section 6D of the Principal Act is amended—
(a) by omitting from subsection (2) “may” and substituting “shall”; and
(b) by omitting subsection (4) and substituting the following subsection:
“(4) The following persons shall be motor traffic officers:
(a) any public servant for the time being performing the duties of a Government Service office referred to in subsection (3);
(b) any other person appointed in writing by the Chief Executive for the purpose.”.