Quote:
8.3.2.1. The primary vision area shall include the area of the windscreen between a plane tangential to the top of the ‘95th Percentile Eye Ellipses’, inclined 10 degrees above the horizontal measured parallel to the longitudinal axis of the vehicle, to a plane tangential to the bottom of the ‘95th Percentile Eye Ellipses’, which includes a horizontal line at ground level transverse to the longitudinal axis of the vehicle and 11 m from the rearmost eye position on the ‘95th Percentile Eye Ellipses’, measured horizontally and parallel to the longitudinal axis of the vehicle and between a vertical plane tangential to the outboard of the ‘95th Percentile Eye Ellipses’ and inclined 15 degrees to the right, to a vertical plane tangential to the inboard of the ‘95th Percentile Eye Ellipses’ and inclined 56 degrees to the left.
8.3.2.1.1. Notwithstanding the requirements of clause 8.3.2.1 it shall be permissible to exclude from the primary vision area, any area of glass within 65 mm of the upper and lower edges of the glass and 90 mm of the side edges of the glass.
The illustration from VSI29 describes the same requirements as section 8.3.2.1 .