(1)For the purposes of this Act (except the provisions of Part IV thereof and the Thirteenth Schedule thereto)—
(a)a mechanically propelled vehicle, being an implement motor for cutting grass which is controlled by a pedestrian and, is not capable of being used or adapted for any other purpose, and
(b)any other mechanically propelled vehicle controlled by a pedestrian which may be specified by regulations made by the Minister for the purposes of this section and of subsection (5) of section ten of the Road Transport Lighting Act, 1957,
shall be treated as not being a motor vehicle.
(2)In the foregoing subsection " controlled by a pedestrian " means that the vehicle either—
(a)is constructed or adapted for use only under such control, or
(b)is constructed or adapted for use either under such control or under the control of a person carried on it but is not for the time being in use under, or proceeding under, the control of a person carried on it.