Document ID: chunk:federal_register_of_legislation:F2016C00338:front:0:p14
Version: federal_register_of_legislation:F2016C00338
Segment Type: other
Provision Reference: 
Character Range: 40125–43162

be subjected, they retain the characteristics prescribed by this Regulation and enable the vehicle to comply with the requirements of this Regulation.

        In particular, it shall not be possible for the lamps to be inadvertently maladjusted.

       5.2.  The illuminating lamps shall be so installed that correct adjustment of their orientation can easily be carried out.

       5.3.  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 retro- reflectors and parallel to that plane in the case of all light-signalling devices. A tolerance of +/- 3 degrees shall be allowed in each direction. In addition, if specifications for fitting are provided by the manufacturer they shall be complied with.

       5.4.  In the absence of specific instructions, the height and orientation of the lamps shall be verified with the vehicle unladen 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.

       5.5.  In the absence of specific instructions:

       5.5.1.  single lamps or reflectors shall be mounted such that their centre of reference lies in the median longitudinal plane of the vehicle;

       5.5.2.  lamps constituting a pair and having the same function shall:

       5.5.2.1.  be mounted symmetrically in relation to the median longitudinal plane;

       5.5.2.2.  be symmetrical to one another in relation to the median longitudinal plane;

       5.5.2.3.  satisfy the same colorimetric requirements; and

       5.5.2.4.  have identical nominal photometric characteristics;

       5.5.2.5.  come on and go off simultaneously;

       5.6.  Lamps may be grouped, combined or reciprocally incorporated with one another provided that all the requirements regarding colour, position, orientation, geometric visibility, electrical connections and other requirements, if any, for each lamp are fulfilled.

       5.7.  The maximum height above ground shall be measured from the highest point and the minimum height from the lowest point of the apparent surface in the direction of the reference axis. For passing beam headlamps, the minimum height from the ground shall be measured from the lowest point of the effective outlet of the optical system (e.g. reflector, lens, projection lens) independent of its utilisation.

        Where the (maximum and minimum) height above the ground clearly meets the requirements of the Regulation, the exact edges of any surface need not be determined. When referring to the distance between lamps, the position, as regards width, shall be determined from the inner edges of the apparent surface in the direction