Document ID: chunk:federal_register_of_legislation:F2024C00148:front:0:p14
Version: federal_register_of_legislation:F2024C00148
Segment Type: other
Provision Reference: 
Character Range: 41147–44142

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 change of curvature

           a: constant for the spherical size of the spherical primary calotte

              2.1.1.10. "Centre of the reflecting surface" means the centre of the visible area of the reflecting surface.

              2.1.1.11. "The radius of curvature of the constituent parts of the mirror" means the radius "c" of the arc of the circle which most closely approximates to the curved form of the part in question.

              2.1.2. "Camera-monitor system (CMS)" means a device for indirect vision as defined in paragraph 2.1., where the field of vision is obtained by means of a camera-monitor combination as defined in paragraphs 2.1.2.1. and 2.1.2.2. below.

              2.1.2.1. "Camera" means a device that renders an image of the outside world and then converts this image into a signal (e.g. video signal).

              2.1.2.2. "Monitor" means a device that converts a signal into images that are rendered into the visual spectrum.

              2.1.3. "Other devices for indirect vision" means devices as defined in paragraph 2.1. above, where the field of vision is not obtained by means of a mirror or a camera-monitor device.

              2.1.4. "Vision support system" means a system to enable the driver to detect and/or see objects in the area adjacent to the vehicle.

              2.1.5. "Luminance contrast" means the brightness ratio between an object and its immediate background/surrounding that allows the object to be distinguished from its background/surroundings. The definition is in accordance with the definition given in ISO 9241-302:2008.

              2.1.6. "Resolution" means the smallest detail that can be discerned with a perceptual system, i.e. perceived as separate from the larger whole. The resolution of the human eye is indicated as "visual acuity".

              2.1.7. "Critical object" means a cylindrical object with a height of 0.50 m and a diameter of 0.30 m.

              2.1.8. "Critical perception" means the level of perception that can just be obtained under critical conditions via the viewing system used. This corresponds to the situation in which the representative scale of the critical object is multiple times larger than the smallest detail that can be perceived via the viewing system.

              2.1.9. "Field of vision" means the section of the tri-dimensional space which is monitored with the help of a device for indirect vision. Unless otherwise stated, this is based on the view on ground level offered by a device and/or devices other than mirrors. This may be limited by the relevant detection distance corresponding to the critical object.

              2.1.10. "Detection distance" means the distance measured from the centre of the lens of the