Document ID: chunk:federal_register_of_legislation:F2023C00919:body:0:p97
Version: federal_register_of_legislation:F2023C00919
Segment Type: other
Provision Reference: 
Character Range: 284847–288125

front and rear axles proportionally to their maximum technically permissible loads, whichever occurs first.
2.3.                                    Vehicles in category N with load surfaces:
2.3.1.                              The angle of the light beam from the dipped beam headlamps shall be determined under the following loading conditions;
2.3.1.1.                        Vehicle unladen and one person in the driver's seat;
2.3.1.2.                        Driver, plus a load so distributed as to give the maximum technically permissible load on the rear axle or axles, or the maximum permissible mass of the vehicle, whichever occurs first, without exceeding a front axle load calculated as the sum of the front axle load of the unladen vehicle plus 25 per cent of the maximum permissible payload on the front axle.  Conversely, the front axle is so considered when the load platform is at the front.
2.4.                                    Vehicles in category N without a load surface:
2.4.1.                              Drawing vehicles for semi trailers:
2.4.1.1.                        Unladen vehicle without a load on the coupling attachment and one person in the driver's seat;
2.4.1.2.                        One person in the driver's seat:  technically permissible load on the coupling attachment in the position of the attachment corresponding to the highest load on the rear axle.
2.4.2.                              Drawing vehicles for trailers:
2.4.2.1.                        Vehicle unladen and one person in the driver's seat;
2.4.2.2.                        One person in the driver's seat, all the other places in the driving cabin being occupied.

Annex 6

Measurement of the variation of dipped beam inclination as a function of load

          1. Scope
This annex specifies a method for measuring variations in motor vehicle dipped beam inclination, in relation to its initial inclination, caused by changes in vehicle attitude due to loading.
2.                                          Definitions
2.1.                                    Initial inclination
2.1.1.                              Stated initial inclination
The value of the dipped beam initial inclination specified by the motor vehicle manufacturer serving as a reference value for the calculation of permissible variations.
2.1.2.                              Measured initial inclination
The mean value of dipped beam inclination or vehicle inclination measured with the vehicle in condition No. 1, as defined in Annex 5, for the category of vehicle under test.  It serves as a reference value for the assessment of variations in beam inclination as the load varies.
2.2.                                    Dipped beam inclination
It may be defined as follows:
Either as the angle, expressed in milliradians, between the direction of the beam towards a characteristic point on the horizontal part of the cut off in the luminous distribution of the headlamp and the horizontal plane,
Or by the tangent of that angle, expressed in percentage inclination, since the angles are small (for these small angles, 1 per cent is equal to 10 mrad).
If the inclination is expressed in percentage inclination, it can be calculated by means of the following formula:
 where:
             h1