(1) Subject to paragraphs (2) and (3) below, no person shall cause or permit any vehicle to stop on the lengths of the special road described in regulations 3(2) and (3) above.
(2) Nothing in paragraph (1) above shall apply to anything done with the permission or upon the direction of a police constable in uniform.
(3) Nothing in paragraph (1) above shall apply—
(a) so as to prevent a vehicle stopping for so long as may be necessary to enable the vehicle to be used in connection with any building operation or demolition being carried out adjacent to the said lengths of the special road, the removal of any obstruction or potential obstruction to traffic, the maintenance, improvement or reconstruction of, or the laying, erection, placing, maintenance, testing, alteration, repair or removal of any structure, works or apparatus, in, on, under, over or adjacent to, the said lengths of the special road;
(b) to a vehicle being used for fire brigade, ambulance or police purposes;
(c) to a vehicle stopping in any case where the person in control of the vehicle—
(i) is required by law to stop; or
(ii) is obliged to stop in order to avoid an accident; or
(iii) is prevented from proceeding by circumstances outwith his control and it is not reasonably practicable for him to drive or move the vehicle off the said lengths of the special road; or
(d) to a vehicle stopping at a place at which tolls are payable for the purpose of paying a toll.
