5.—(1) The prohibition in regulation 3 does not apply to—
(a)any vehicle being used in an emergency for fire brigade, coastguard, ambulance or police purposes;
(b)any vehicle being used in connection with the removal of any obstruction, or in connection with authorised works to or in the relevant road; or
(c)any vehicle being used in connection with the maintenance, inspection, repair, cleaning, clearance, alteration or improvement of the relevant road.
(2) No speed limit imposed by virtue of regulation 4 applies to vehicles falling within regulation 3(4) of the Road Traffic Exemptions (Special Forces) (Variation and Amendment) Regulations 2011(1) when used in accordance with regulation 3(5) of those Regulations.