The Traffic Signs Regulations and General Directions 2016

5.  The prohibitions in paragraphs 3 and 4 do not apply to a vehicle being used—

(a) for at least one of the purposes mentioned in paragraph 5(6) of Part 1 of Schedule 14;

(b) for traffic officer purposes; or

(c) for traffic authority purposes where the vehicle is being used in connection with—

(i) an accident or other incident; or

(ii) the execution of works on the road (including the erection of barriers and signs in connection with the execution of works); or

(iii) in the exercise of functions under section 67(1) of the 1984 Act(1),

when observance of the prohibition would be likely to hinder the use of the vehicle for the purpose for which it is being used.

(1)

c. 27. Section 67 was amended by the Road Traffic (Consequential Provisions) Act 1988 (c. 54), Schedule 3, paragraph 25(5), by the New Roads and Street Works Act 1991 (c. 22), Schedule 8, Part 2, paragraph.50 and by the Civil Contingencies Act 2004 (c. 36), Schedule 2, Part 3, paragraph 16(3).