13.—(1) A sign provided for in this Part need not be illuminated.
(2) Paragraph (1) does not apply to a sign conveying—
(a)the route of a diversion (except routes exclusively for pedestrians, cyclists or equestrians);
(b)information about future or ongoing road works;
(c)information about check points at which goods vehicles or public service vehicles may be required to stop;
(d)a temporary hazard warning in connection with the execution of works, or a temporary obstruction; or
(e)temporary information for drivers of wide loads about action to be taken in respect of road works ahead.