6.1.1.4.1. The dimension of the projection of a component which is mounted on a convex surface may be determined either directly or by reference to a drawing of an appropriate section of this component in its installed condition.
6.1.1.4.2. If the dimension of the projection of a component which is mounted on a surface other than convex cannot be determined by simple measurement, it shall be determined by the maximum variation of the distance of the centre of a 100 mm diameter sphere from the nominal line of the panel when the sphere is moved over and is in constant contact with that component. Figure 1 shows an example of the use of this procedure.
Figure 1
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6.1.1.5. Edges of fixing holes or recesses of which the diameter or longest diagonal is less than 12 mm are exempt from the radius requirements of paragraph 6.1.1.3 above provided that they are blunted.
6.1.1.6. The device for the attachment of mirrors to the vehicle shall be so designed that a cylinder with a 70 mm radius (50 mm in the case of an L-category vehicle), having as its axis the axis, or one of the axes, of pivot or rotation which ensures deflection of the mirror in the direction of impact concerned, passes through at least part of the surface to which the device is attached.
6.1.1.7. The parts of exterior mirrors referred to in paragraphs 6.1.1.2 and 6.1.1.3 above which are made of a material with a Shore A hardness not exceeding 60 are exempt from the relevant provisions.
6.1.1.8. In the case of those parts of interior mirrors which are made of a material with a Shore A hardness of less than 50 and which are mounted on a rigid support, the requirements of paragraphs 6.1.1.2 and 6.1.1.3 above shall only apply to the support.
6.1.2. Special specifications
6.1.2.1. Dimensions
6.1.2.1.1. Interior rear-view mirrors (Class I)
The dimensions of the reflecting surface shall be such that it is possible to inscribe thereon a rectangle one side of which is 40 mm and the other ‘a’ mm in length, where
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and ‘r’ is the radius of curvature.
6.1.2.1.2. Main exterior rear-view mirrors (Classes II and III)
6.1.2.1.2.1. The dimensions of the reflecting surface shall be such that it is possible to inscribe therein:
(a) A rectangle 40 mm high the base length of which, measured in millimetres, has the value ‘a’;
(b) A segment which is parallel to the height of the rectangle and the length of which, expressed in millimetres, has the value ‘b’.
6.1.2.1.2.2. The minimum values of ‘a’ and ‘b’ are given in the table below:
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