Division 2 ZONE OF CLEARANCEF1

United Kingdom Repealed

1. 2.1The 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.
2. 2.2The boundaries of the zone shall be taken as:
3. 2.3Division 2.3
4. 2.3.1For the purpose of defining the zone of clearance in point 2.1, the seat shall be at the rearmost point of any horizontal adjustment range. It shall be set at the mid-point of the vertical adjustment range where this is independent of adjustment of its horizontal position.
5. 2.3.2Division 2.3.2
6. 2.3.3Where a seat suspension is provided with adjustment for the weight of the driver, this shall be set so that the seat is at the mid-point of its dynamic range.
7. 2.3.4If it is not possible to determine definite tangents to each area of the backrest (above and below the lumbar region) the following should be done: