be able to support the vehicle in such a way as to provide lateral stability whether the vehicle is on a horizontal supporting surface or on a slope in order to prevent its leaning further too easily (and in so doing rotating about the point of support provided by the prop stand) or moving too easily into a vertical position and beyond (and in so doing does not swing over to the side opposite the prop stand);
be able to support the vehicle in such a way as to maintain stability when the vehicle is parked on a slope in accordance with point 6.2.2;
be able to swing back automatically into the retracted or travelling position:
when the vehicle returns to its normal (vertical) driving position;
or
when the vehicle moves forward as a result of deliberate action by the driver;
notwithstanding the requirements set out in point 3.1.1.3, be designed and constructed in such a way that they do not close automatically if the angle of lean is altered unexpectedly (for example, if the vehicle is pushed lightly by a third party or by a gust of wind arising from the passage of a vehicle):
once in the extended or parking position;
the vehicle being leaned in order to bring the outer extremity of the prop stand into contact with the ground;
and
the vehicle being left unattended in its parking position.
be able to support the vehicle with either one or both wheels in contact with the supporting surface or without any of the wheels being in contact with that surface in such a way as to confer stability on that vehicle:
on a horizontal supporting surface;
in a leaning position;
on a slope in accordance with point 6.2.2;
be able to fold backwards automatically into the retracted or travelling position:
when the vehicle moves forward in such a way as to raise the centre stand from the supporting surface.