(1)For the purposes of the Road Traffic Acts—
(a)a mechanically propelled vehicle being an implement for cutting grass which is controlled by a pedestrian and is not capable of being used or adapted for any other purpose,
(b)any other mechanically propelled vehicle controlled by a pedestrian which may be specified by regulations made by the Secretary of State for the purposes of this section and section 140 of the [1984 c. 27.] Road Traffic Regulation Act 1984, and
(c)an electrically assisted pedal cycle of such a class as may be prescribed by regulations so made,
is to be treated as not being a motor vehicle.
(2)In subsection (1) above “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.