2. In these Rules, unless the context otherwise requires —
“goods vehicle” means a motor vehicle constructed or adapted for the carriage of goods by means of a trailer or otherwise;
“mobile engineering plant” means a motor vehicle designed for use in private premises and used on a road only —
(a)
in passing from one part of any such premises to another or to other private premises in the immediate neighbourhood; or
(b)
in connection with road works or engineering operations while at or in the immediate neighbourhood of the site of such works or operations;
“motor tractor” means a motor vehicle which is not constructed to carry any load other than —
(a)
water, fuel, accumulators and other equipment and materials used for the purpose of its propulsion; and
(b)
loose tools and loose equipment;
“motor vehicle” means a mechanically propelled vehicle intended or adapted for use on roads or places where engineering operations or road or other works are being carried out;
“passenger vehicle” means a motor vehicle constructed or adapted solely for the carriage of passengers and their personal effects;
“pneumatic tyre” means a tyre which complies in all respects with the following requirements:
(a)
it is provided with, or together with the wheel upon which it is mounted shall form, a continuous closed chamber inflated to a pressure substantially exceeding atmospheric pressure when the tyre is in the condition in which it is normally used, but is not subjected to any load;
(b)
it is capable of being inflated and deflated without removal from the wheel or vehicle; and
(c)
it is such that, when it is deflated and is subjected to a normal load, the sides of the tyre collapse;
“track laying vehicle” means a vehicle so designed and constructed that the weight thereof is transmitted to the road surface either by means of —
(a)
continuous tracks; or
(b)
a combination of wheels and continuous tracks in such circumstances that the weight transmitted to the road surface by the tracks is not less than half the weight of the vehicle.