Division 2.1 The zone of clearance is illustrated in Annex IV, fig. 3, and is defined in relation to a vertical reference plane generally longitudinal to the tractor and passing through a seat reference point, described in point 2.3, and the centre of the steering wheel. The reference plane shall be assumed to move horizontally with the seat and steering wheel during impacts but to remain perpendicular to the floor of the tractor or of the roll-over protection structure if this is resiliently mounted.F1

United Kingdom Repealed