b) 1,200 mm for Class II and III mirrors.

c) 300 mm for Class IV and V mirrors.

d) 200 mm for mirrors Class VI.

2.1.3.3. Differences between the radii of curvature of mirrors:

a) The difference between r_i or r'_i, and r_p at each reference point shall not exceed 0.15 r;

b) The difference between any of the radii of curvature (r_P1, r_P2, r_P3) and r shall not exceed 0.15 r;

c) When “r” is not less than 3,000 mm, the value of 0.15 r quoted in a) and b) above is replaced by 0.25 r.

2.1.3.4. The value of the normal coefficient of reflection, as determined according to the method described in Annex B to this Regulation, shall be not less than 40%. In the case of reflecting surfaces with a changeable degree of reflection, the “day” position shall allow the colours of the signals used for road traffic to be recognized. The value of the normal coefficient of reflection in the “night” position shall be not less than 4%.

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2.1.4.1. Mirrors shall be subjected to the tests described in Annex D and Annex E to this Regulation to determine their behavior under impact on the reflecting surface and bending of the protective housing.

The tests shall not be required in the case of mirrors Classes V and VI.

2.1.4.2. The mirror shall not break during the tests. However, breakage of the reflecting surface of the mirror will be allowed if the mirror is made of safety glass or the following condition is fulfilled:

The fragments of glass still adhere to the back of the housing or to a surface firmly attached to the housing; partial separation of the glass from its backing is admissible provided that this does not exceed 2.5 mm on either side of the cracks. It is permissible for small splinters to become detached from the surface of the glass at the point of impact.

2.1.4