Section 17.
CLASS I:
Heavy and light locomotives, motor tractors, heavy motor cars, motor cars and motor cycles whereof the cylinder capacity of the engine is not less than 50 cubic centimetres, and trailers drawn thereby, which comply with general regulations as to construction and use made, or having effect as if made, under section 40 of the [1972 c. 20.] Road Traffic Act 1972 and in the case of which the following conditions are satisfied:—
that the whole weight of the vehicle is transmitted to the road surface by means of wheels ;
that all wheels of the vehicle are equipped with pneumatic tyres ;
that the vehicle is not controlled by a pedestrian ;
that the vehicle is not a vehicle chargeable with duty under paragraph 2 of Part I of Schedule 3 to the [1971 c. 10.] Vehicles (Excise) Act 1971; and
in the case of a motor vehicle, that it 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.
CLASS II:
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 section 42(1) of the Road Traffic Act 1972.
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 section 42(1) of the Road Traffic Act 1972.
Motor vehicles and trailers, to which any of the following Articles of the [S.I. 1973/1101.] Motor 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 order under section 42(1) of the Road Traffic Act 1972, 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.
CLASS III:
Motor vehicles controlled by pedestrians.
CLASS IV:
All motor vehicles (other than invalid carriages and motor cycles whereof the cylinder capacity of the engine is less than 50 cubic centimetres) not comprised in Class I, Class II or Class III.
CLASS V:
Vehicles drawn by animals.
CLASS VI:
Vehicles (other than pedal cycles, perambulators, push-chairs and other forms of baby carriages) drawn or propelled by pedestrains.
CLASS VII:
Pedal cycles.
CLASS VIII:
Animals ridden, led or driven.
CLASS IX:
Pedestrians, perambulators, push-chairs and other forms of baby carriages and dogs held on a lead.
CLASS X:
Motor cycles whereof the cylinder capacity of the engine is less than 50 cubic centimetres.
CLASS XI:
Invalid carriages.
In this Schedule any expression defined for the purposes of the [1972 c. 20.] Road Traffic Act 1972 has the same meaning as in that Act and the expression " abnormal indivisible load " has the same meaning as in the [S.I. 1973/1101.] Motor Vehicles (Authorisation of Special Types) General Order 1973.