This International Standard specifies a method for measuring variations in the dipped-beam inclination of motor vehicle headlamps, in relation to the initial inclination, caused by changes in vehicle attitude due to loading. This measurement method may be used particularly during vehicle type approval tests.

Loading conditions of vehicles are specified in annex A. They are to be used except when legal regulations require different loading conditions.

Annex B establishes a classification of headlamps, and gives examples of measurement methods applicable according to the classification. Annex C gives a photometric method of determining the position of a point of the conventional cut-off, which is complementary to one of the measurement method examples in annex B.

This International Standard is applicable to motor vehicles as defined in ISO 3833.