[F1ANNEX I U.K. DEFINITIONS
Textual Amendments
1. Rear-view mirror means any device, excluding complex optical systems such as periscopes, intended to give a clear view to the rear and side of the vehicle within the fields of vision defined in item 5 of Annex III. U.K.
2. Interior rear-view mirror means a device as defined in item 1 which can be fitted in the passenger compartment of a vehicle. U.K.
3. Exterior rear-view mirror means a device as defined in item 1 which can be mounted on the external surface of a vehicle. U.K.
4. Surveillance rear-view mirror means a rear-view mirror other than a device of the type defined in item 1 which can be fitted to the inside or outside of the vehicle in order to provide fields of vision other than those specified in item 5 of Annex III. U.K.
5. Rear-view mirror type means devices which do not differ significantly in respect of the following essential characteristics: U.K.
5.1. the dimensions and radius of curvature of the rear-view mirror's reflecting surface; U.K.
5.2. the design, shape or materials of the rear-view mirrors, including the connection with the bodywork. U.K.
6. Class of rear-view mirror means all devices having one or more common characteristics or functions. They are classified as follows: U.K.
| Class I: | Interior rear-view mirrors, giving the field of vision defined in item 5.2 of Annex III. |
| Classes II and III: | ‘ Main ’ exterior rear-view mirrors, giving the fields of vision defined in item 5.3 of Annex III. |
| Class IV: | ‘ Wide-angle ’ exterior rear-view mirrors, giving the field of vision defined in item 5.4 of Annex III. |
| Class V: | ‘ Close-proximity ’ exterior rear-view mirrors, giving the field of vision defined in item 5.5 of Annex III. |
7. r means the average of the radii of curvature measured over the reflecting surface, in accordance with the method described in item 2 of Appendix 1 to this Annex. U.K.
8. The principal radii of curvature at one point on the reflecting surface (r i ) means the values obtained with the apparatus defined in Appendix 1, measured on the arc of the reflecting surface passing through the centre of this surface parallel to the segment b, as defined in item 2.2.1 of Annex II and on the arc perpendicular to this segment. U.K.
9. The radius of curvature at one point on the reflecting surface (r p ) means the arithmetical average of the principal radii of curvature r i and r′ i i.e.: U.K.
10. Centre of the reflecting surface means the centroid of the visible area of the reflecting surface. U.K.
11. The radius of curvature of the constituent parts of the rear-view mirror means the radius ‘c’ of the arc of the circle which most closely approximates to the curved form of the part in question. U.K.
12. The driver's ocular points means two points 65 mm apart and 635 mm vertically above point R of the driver's seat as defined in Appendix 2 to this Annex. The straight line joining these points runs perpendicular to the vertical longitudinal median plane of the vehicle. The centre of the segment joining the two ocular points is in a vertical longitudinal plane which must pass through the centre of the driver's designated seating position, as specified by the vehicle manufacturer. U.K.
13. Ambinocular vision means the total field of vision obtained by the superimposition of the monocular fields of the right eye and the left eye (see diagram below). U.K.
| E | = interior rear-view mirror |
| OD | = driver's eyes |
| OE | |
| ID | = virtual monocular images |
| IE | |
| I | = virtual ambinocular image |
| A | = angle of vision of left eye |
| B | = angle of vision of right eye |
| C | = binocular angle of vision |
| D | = ambinocular angle of vision |
14. Type of vehicle as regards rear-view mirrors means motor vehicles which are identical in respect of the following basic features: U.K.
14.1. the bodywork features which reduce the field of vision; U.K.
14.2. the coordinates of point R; U.K.
14.3. the prescribed positions and types of compulsory and (if fitted) optional rear-view mirror. U.K.
15. Vehicles of categories M 1 , M 2 , M 3 , N 1 , N 2 , N 3 means those defined in Annex I to Directives 70/156/EEC. U.K.
Appendix 1 to Annex I PROCEDURE FOR DETERMINING THE RADIUS OF CURVATURE ‘ r ’ OF THE REFLECTING SURFACE OF A REAR-VIEW MIRROR
1. MEASUREMENTS U.K.
1.1. Equipment U.K.
The ‘ spherometer ’ described in Figure 1 is used.
1.2. Measuring points U.K.
1.2.1. The principal radii of curvature shall be measured at three points situated as close as possible to positions at one-third, one-half and two-thirds of the distance along the arc of the reflecting surface passing through the centre of this surface and parallel to segment b, or of the arc passing through the centre of the reflecting surface which is perpendicular to it if this arc is the longer. U.K.
1.2.2. Where, owing to the size of the reflecting surface, it is impossible to obtain measurements in the directions defined in item 8 of this Annex, the technical services responsible for the tests may take measurements at the said point in two perpendicular directions as close as possible to those prescribed above. U.K.
2. CALCULATION OF THE RADIUS OF CURVATURE ‘r’U.K.
‘ r ’ expressed in mm is calculated from the formula: 
where:
r p1
=
the radius of curvature at the first measuring point,
r p2
=
the radius of curvature at the second measuring point,
r p3
=
the radius of curvature at the third measuring point.
Appendix 2 to Annex I PROCEDURE FOR DETERMINING THE H POINT AND VERIFYING THE RELATIVE POSITIONS OF THE R AND H POINTS
The relevant parts of Annex III to Directive 77/649/EEC are applicable.]