Document ID: chunk:federal_register_of_legislation:F2023L01006:front:0:p10
Version: federal_register_of_legislation:F2023L01006
Segment Type: other
Provision Reference: 
Character Range: 27473–30487

mirrors may be adjustable.
         6.1.2. Special specifications
         6.1.2.1. Dimensions
         6.1.2.1.1. The contours of the reflecting surface shall be of simple geometric form and its dimensions such that the mirror provides the field of vision specified in paragraph 15.2. of this Regulation.
         6.1.2.1.2. 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 millimeters, has the value "a";
              (b) A segment which is parallel to the height of the rectangle and the length of which, expressed in millimeters, has the value "b".
         6.1.2.2. Reflecting surface and coefficients of reflection
         6.1.2.2.1. The reflecting surface of a mirror shall be either flat or spherically convex. Exterior mirrors may be equipped with an additional aspherical part provided that the main mirror fulfils the requirements of the indirect field of vision.
         6.1.2.2.2. Differences between the radii of curvature of mirrors
         6.1.2.2.2.1. The difference between ri or r'i, and rp at each reference point shall not exceed 0.15 r.
         6.1.2.2.2.2. The difference between any of the radii of curvature (rp1, rp2, and rp3) and r shall not exceed 0.15 r.
         6.1.2.2.2.3. When r is not less than 3,000 mm, the value of 0.15 r quoted in paragraphs 6.1.2.2.2.1. and 6.1.2.2.2.2. above is replaced by 0.25 r.
         6.1.2.2.3. The value of the normal coefficient of reflection, as determined according to the method described in Annex 6, shall be not less than 40 per cent.
         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 per cent.
         6.1.2.2.4. The reflecting surface shall retain the characteristics laid down in paragraph 6.1.2.2.3. above in spite of prolonged exposure to adverse weather conditions in normal use.
         7. Modification of the type of device for means of rear visibility and extension of approval
         7.1. Every modification to an existing type of device for means of rear visibility including its connection to the bodywork shall be notified to the Type Approval Authority which approved the type of device for means of rear visibility. The Type Approval Authority shall then either:
              (a) Decide, in consultation with the manufacturer, that a new type-approval is to be granted; or
              (b) Apply the procedure contained in paragraph 7.1.1. (Revision) and, if applicable, the procedure contained in paragraph 7.1.2. (Extension).
         7.1.1. Revision
         When particulars recorded in the information folder have changed and the Type Approval Authority considers that the modifications made are unlikely to have an appreciable adverse effect and that in