# Council Directive of 21 December 1977 on the approximation of the laws of the Member States relating to the defrosting and demisting systems of glazed surfaces of motor vehicles (78/317/EEC) (repealed), Appendix ANNEX IV: PROCEDURE FOR DETERMINING VISION AREAS ON WINDSCREENS OF CATEGORY VEHICLES IN RELATION TO THE V POINTS

Extent: E+W+S+N.I.
Status: repealed

1.
POSITIONS OF THE V POINTS
1.1.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2.
Table I indicates the basic coordinates for a design seat-back angle of 25o. The positive direction for the coordinates is indicated in figure 1 of Annex III.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3.1.
Table II shows the further corrections to be made to the X and Z coordinates of each V point when the design seat-back angle is not 25o. The positive direction for the coordinates is shown in figure 1 of Annex III.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.
VISION AREAS
2.1.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2.
Vision area A is the area on the outer surface of the windscreen bounded by the following four planes extending forward from the V point (see figure 1):
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3.
Vision area B is the area of the outer surface of the windscreen which is more than 25 mm from the outer edge of the transparent area and is bounded by the intersection of the following four planes with the outer surface of the windscreen (see figure 2):
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

---
Source: https://www.legislation.gov.uk/eudr/1978/317/annex/1/annex/IV (the official version)
Page: https://openlegislation.uk/eu-directive-1978-317/annex-1/annex-IV
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.