Document ID: chunk:federal_register_of_legislation:F2023C00133:body:0:p3
Version: federal_register_of_legislation:F2023C00133
Segment Type: other
Provision Reference: 
Character Range: 7714–10756

to other road users;

         4.18.                                'Front Fog Lamp' means the lamp used to improve the illumination of the road in case of fog, snowfall, rainstorms or dust clouds;

         4.19.                                'Rear Fog Lamp' means the lamp used to make the vehicle more easily visible from the rear in dense fog;

         4.20.                                'Reversing Lamp' means the lamp used to illuminate the road to the rear of the vehicle and to warn other road-users that the vehicle is reversing or about to reverse;

         4.21.                                'Parking Lamp' means a lamp which is used to draw attention to the presence of a stationary vehicle in a built-up area; in these circumstances it replaces the position (side) lamps;

4.22.                                'Illuminating Surface' (see ADR 13/00, Appendix 1, Annex 3);
4.22.1.                          'Light Emitting Surface' means all or part of the exterior surface of the transparent lens that encloses the lighting or light-signalling device and allows it to emit light;
4.22.2.                          'Illuminating Surface of a Lamp' (clauses 4.9., 4.10., 4.18. and 4.21.) means the orthogonal projection of the full aperture of the reflector in a transverse plane. If the lamp glass (or glasses) extend(s) over part only of the full aperture of the reflector, then the projection of that part only is taken into account. In the case of a passing lamp, the illuminating surface is limited on the side of the cut-off by the apparent projection of the line of the cut-off on to the lens. If the reflector and glass are adjustable, the mean adjustment should be used;
4.22.3.                          'Illuminating Surface of a Light-signalling Device other than a Reflex Reflector' means the orthogonal projection of the lamp on a plane perpendicular to its axis of reference and in contact with the transparent outer surface of the lamp, such projection being bound by the covering of the screen edges situated in this plane, each allowing only 98 per cent of the total intensity of the light to subsist in the direction of the axis of reference; for the purposes of determining the lower, upper and lateral edges of the lamp only screens having horizontal or vertical edges shall be used;
4.22.4.                          'Illuminating Surface of a Reflex Reflector' means the 'Illuminating Surface' of a 'Reflex Reflector' in a plane perpendicular to its axis of reference and delimited by planes contiguous to the outermost parts of the reflex reflector's optical system and parallel to this axis; for the purposes of determining the lower, upper and lateral limits of the device only vertical and horizontal planes shall be used;
4.22.5.                          'Apparent surface' for a defined direction of observation means the orthogonal projection of the light-emitting surface on a plane perpendicular to the direction of observation;
4.23.                                'Centre of Reference' means the