1. 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 under Article 28 of the Road Traffic Order and in the case of which the following conditions are satisfied—
(i)that the whole weight of the vehicle is transmitted to the road surface by means of wheels;
(ii)that all wheels of the vehicle are equipped with pneumatic tyres;
(iii)that the vehicle is not controlled by a pedestrian;
(iv)in the case of a motor vehicle 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; and
(v)that the vehicle is not a vehicle mentioned in paragraph 2 of Part I of Schedule 3 to the Vehicles (Excise) Act 1971(1).