4

Nothing in article 3 shall apply—

a

to render it unlawful to cause or permit a vehicle waiting on any part of the new trunk road, for so long as may be necessary to enable that vehicle to be used in connection with—

i

the removal of any obstruction to traffic,

ii

the maintenance, improvement or reconstruction of the trunk road, or

iii

the laying, erection, inspection, maintenance, alteration, repair, renewal or removal in or near the trunk road of any sewer, main, pipe, conduit, wire, cable or other apparatus for the supply of gas, water, electricity or any telecommunications apparatus as defined in Schedule 2 to the Telecommunications Act 19843; or

b

in relation to a vehicle being used—

i

for police, ambulance or fire brigade purposes,

ii

in the service of a local authority in pursuance of statutory powers or duties,

iii

in the service of a water or sewerage undertaker within the meaning of the Water Industry Act 19914; or

c

in relation to a vehicle waiting when the person in control of it is—

i

required by law to stop,

ii

obliged to stop in order to avoid an accident, or

iii

prevented from proceeding by circumstances outside his or her control.