19Notwithstanding section 16, a person of fourteen years of age or older may operate an off-road vehicle within 7.5 metres of the travelled portion of a highway if
(a)
it is necessary to do so in the course of unloading the vehicle from a trailer or other conveyance which is parked on or near the travelled portion of the highway, and
(b)
upon being unloaded, the vehicle is immediately moved to a point more than 7.5Â metres from the travelled portion of the highway.