| 5.6.2.4. | Horizontal and vertical angles for the field of geometric visibility are shown in Annex 4, Figures A4-XIII. The directions H = 0° and V = 0° correspond to the axis of reference. On the vehicle they are horizontal, parallel to the median longitudinal plane of the vehicle and oriented in the required direction of visibility. They pass through the centre of reference. | a0c0 |