Document ID: chunk:federal_register_of_legislation:F2023C00133:body:0:p6
Version: federal_register_of_legislation:F2023C00133
Segment Type: other
Provision Reference: 
Character Range: 16518–19727

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° shall be allowed in each direction. In addition, if specifications for fitting are provided by the manufacturer they shall be complied with.
6.4.                                    In the absence of specific instructions, the height and orientation of the lamps shall be verified with the vehicle at its 'Unladen Mass' and placed on a flat horizontal surface, its median longitudinal plane being vertical and the handlebars being in the position corresponding to the straight ahead movement. The tyre pressures shall be those prescribed by the manufacturer for the particular conditions of loading required in this Regulation.
6.5.                                    In the absence of specific instructions lamps constituting a pair and having the same function shall:
6.5.1.                              be mounted symmetrically in relation to the median longitudinal plane;
6.5.2.                              be symmetrical to one another in relation to the median longitudinal plane;
6.5.3.                              satisfy the same colorimetric requirements; and
6.5.4.                              have identical nominal photometric characteristics.
6.6.                                    In the absence of specific instructions, lamps having different functions may be independent or be grouped, combined or incorporated in one device, on condition that each such lamp satisfies the requirements applicable to it.
6.7.                                    The maximum height above ground shall be measured from the highest point and the minimum height from the lowest point of the 'Illuminating Surface'. For 'Dipped-beam Headlamps', the minimum height from the ground shall be measured from the bottom of the lens or the reflector, whichever of these is the higher.
6.8.                                    The position, as regards width, will be determined from the edge of the 'Illuminating Surface' which is the furthest from the median longitudinal plane of the vehicle when referred to the overall width, and from the inner edges of the 'Illuminating Surfaces' when referred to the distance between the lamps.
6.9.                                    In the absence of specific instructions, no lamps other than 'Direction Indicator Lamps' and the 'Vehicle Hazard Warning Signal' shall be flashing lamps.
6.10.                                No red light which could give rise to confusion emitted from a lamp shall be visible toward the front and no white light which could give rise to confusion emitted from a lamp other than from the 'Reversing Lamp' shall be visible towards the rear.  Lamps used to illuminate the vehicle's interior shall not be taken into consideration in this respect.
6.10.1.                          This requirement is considered to have been met if:
6.10.1.1.                    for the visibility of a red light towards the front: there must be no direct visibility of a light-emitting surface of a red lamp if viewed by an observer