Document ID: chunk:federal_register_of_legislation:F2023C00133:body:0:p5
Version: federal_register_of_legislation:F2023C00133
Segment Type: other
Provision Reference: 
Character Range: 13529–16750

or by any other suitable means; the term "vanishing lamp" is used more particularly to describe a lamp which, by its movement, can be concealed inside the bodywork;
4.31.                                Single and Multiple Lamps:
4.31.1.                          A 'Single Lamp' also means any assembly of two or more lamps, whether identical or not, having the same function and emitting light of the same colour, if it comprises devices, the projection of whose aggregate 'Illuminating Surfaces' in a given transverse plane occupies 60 per cent or more of the area of the smallest rectangle circumscribing the projections of those 'Illuminating Surfaces', provided that such combination is, where approval is required, approved as a 'Single Lamp'.
This possible assembly does not apply to 'Main-beam Headlamps', 'Dipped-beam Headlamps' and 'Front Fog Lamps',
4.31.2.                          'Two Lamps' or an even number of lamps, means a single light-emitting surface in the shape of a band or strip if:
4.31.2.1.                    such band or strip is place symmetrically in relation to the median longitudinal plane of the vehicle,
4.31.2.2.                    it extends on both sides to within at least 0.4m of the 'Extreme Outer Edge' of the vehicle,
4.31.2.3.                    it is not less than 0.8m long,
4.31.2.4.                    the illumination of such surface shall be provided by not less than two light sources placed as close as possible to its ends;
4.31.2.5.                    the light-emitting surface may be constituted by a number of juxtaposed elements on condition that the projections of the several individual light-emitting surfaces on a transverse plane occupy not less than 60 per cent of the area of the smallest rectangle circumscribing the projections of the said individual light-emitting surfaces.
4.32.                                'Overall Width' means the distance between the two vertical planes defined in clause 4.25. above.
5.                                          REQUIREMENTS
5.1.                                    Lighting and light-signalling devices shall be installed to comply with the requirements of this Rule.
6.                                          GENERAL SPECIFICATIONS
6.1.                                    The lighting and light-signalling devices shall be so fitted that in normal conditions of use, and notwithstanding the vibrations to which they may be subjected, they retain the characteristics prescribed by this Rule and enable the vehicle to comply with the requirements of this Rule. In particular, it shall not be possible for the lamps to be inadvertently maladjusted.
6.2.                                    Lamps shall be so installed that correct adjustment of their orientation can easily be carried out.
6.3.                                    For all light-signalling devices the 'Reference Axis' of the lamp when fitted to the vehicle shall be parallel to the bearing plane of the vehicle on the road; in addition, it shall be perpendicular to the median longitudinal plane of the vehicle in the case of side 'Reflex Reflectors' and parallel to that plane in the case of all other light-signalling devices. A tolerance of 3°