Document ID: chunk:federal_register_of_legislation:F2024C00148:front:0:p13
Version: federal_register_of_legislation:F2024C00148
Segment Type: other
Provision Reference: 
Character Range: 38453–41382

passenger's side of vehicles of category M1, M2, M3, N1 and N2 ≤ 7.5 t.

I.  Devices for indirect vision
2.  Definitions
          For the purposes of this Regulation:

              2.1. "Devices for indirect vision" means devices intended to give a clear view of the rear, side or front of the vehicle within the fields of vision defined in paragraph 15.2.4. These can be conventional mirrors, camera-monitors or other devices able to present information about the indirect field of vision to the driver.

              2.1.1. "Mirror" means any device, excluding devices such as periscopes, intended to give a clear view to the rear, side or front of the vehicle within the fields of vision defined in paragraph 15.2.4. by means of a reflective surface.

              2.1.1.1. "Interior mirror" means a device as defined in paragraph 2.1.1. above, which can be fitted in the passenger compartment of a vehicle.

              2.1.1.2. "Exterior mirror" means a device as defined in paragraph 2.1.1. above, which can be mounted on the external surface of a vehicle.

              2.1.1.3. "Surveillance mirror" means a mirror other than the ones defined in paragraph 2.1.1. above which can be fitted to the inside or outside of the vehicle in order to provide fields of vision other than those specified in paragraph 15.2.4. of this Regulation.

              2.1.1.4. "r" means the average of the radii of curvature measured over the reflecting surface, in accordance with the method described in Annex 7.

              2.1.1.5. "The principal radii of curvature at one point on the reflecting surface (ri)" means the values obtained with the apparatus defined in Annex 7, measured on the arc of the reflecting surface passing through the centre of this surface parallel to the segment b, as defined in paragraph 6.1.2.1.2.1. of this Regulation and on the arc perpendicular to this segment.

              2.1.1.6. "The radius of curvature at one point on the reflecting surface (rp)" means the arithmetical average of the principal radii of curvature ri and , i.e.:

2.1.1.7. "Spherical surface" means a convex surface, which has, in both horizontal and vertical direction, measured radii of curvature compliant with the provisions given in paragraphs 6.1.2.2.2 and 6.1.2.2.4..
              2.1.1.8. "Aspherical surface" means a convex surface, which may have variable radii of curvature both in the horizontal and vertical direction.

              2.1.1.9. "Aspherical mirror" means a mirror composed of a spherical and an aspherical part, defined in 2.1.1.7 and 2.1.1.8 respectively, in which the transition of the reflecting surface from the spherical to the aspherical part has to be marked. The curvature of the main axis of the mirror is defined in the x/y coordinate system defined by the radius of the spherical primary calotte with:

Where:
R: nominal radius in the spherical part
           k: constant for the