Time for vehicles to comply with rule 3
4.—(1)  Every —
(a)goods vehicle the length of which exceeds 10 metres;
(b)trailer which forms part of a combination of vehicles the overall length of which exceeds 10 metres; and
(c)trailer the length of which exceeds 5 metres,
registered on or after 1st July 1981 shall comply with rule 3.
(2)  On or after 1st January 1983, every registered —
(a)goods vehicle the length of which exceeds 10 metres;
(b)trailer which forms part of a combination of vehicles the overall length of which exceeds 10 metres; and
(c)trailer the length of which exceeds 5 metres,
shall comply with rule 3.