Motor vehicles and trailers the use of which for or in connection with the conveyance of abnormal indivisible loads is authorised by order made, or having effect as if made, by the Minister under F1section 44(1) of the Road Traffic Act 1988.

Motor vehicles and trailers constructed for naval, military, air force or other defence purposes, the use of which is authorised by order made, or having effect as if made, by the Minister under F1section 44(1) of the Road Traffic Act 1988.

Motor vehicles and trailers, to which any of the following Articles of the M1Motor Vehicles (Authorisation of Special Types) General Order 1973 namely, Article 16 (which relates to vehicles for moving excavated material), Article 17 (which relates inter alia to vehicles constructed for use outside the United Kingdom) and Article 21 (which relates to engineering plant) relate and which are authorised to be used by any of those Articles of the said order or by any other F2order made, or having effect as if made, under section 44(1) of the Road Traffic Act 1988, the said motor vehicles being vehicles in respect of which the following condition is satisfied, that is to say, that the vehicle is so constructed as to be capable of attaining a speed of 25 miles per hour on the level under its own power, when unladen and not drawing a trailer.