Document ID: chunk:federal_register_of_legislation:F2007C00078:body:0:p8
Version: federal_register_of_legislation:F2007C00078
Segment Type: other
Provision Reference: 
Character Range: 22806–25609

that source; for the purpose of this Regulation the reflective number plates are not considered as reflex reflectors;

2.5.14.  "vehicle hazard warning signal" means the simultaneous operation of all of a vehicle's direction-indicator lamps to show that the vehicle temporarily constitutes a               special danger to other road users;

2.5.15. "front fog lamp" means the lamp used to improve the illumination of the road in case of fog, snowfall, rainstorms or dust clouds;

2.5.16. "rear fog lamp" means the lamp used to make the vehicle more easily visible from the rear in dense fog;

2.6. "illuminating surface" (see annex 3);

2.6.1. "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;

2.6.2.  "illuminating surface of a lamp" (paragraphs 2.5.6., 2.5.7., and 2.5.15.), 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;

2.6.3.  "illuminating surface of a light-signalling device other than a reflex reflector" (paragraphs 2.5.8. to 2.5.12., 2.5.14. and 2.5.16.) 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% 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;

2.6.4. "illuminating surface of a reflex reflector" (paragraph 2.5.13.) 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;

2.7. "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;

2.8. "axis of reference" (or "reference axis") means the characteristic axis of the light signal determined by the manufacturer of the lamp for