The photometric and colorimetric requirements of a lamp shall be fulfilled when all other functions with which this Lamp is grouped, combined or reciprocally incorporated are switched OFF.However, when a front or rear position lamp is reciprocally incorporated with one or more other function(s) which can be switched ON together with them, the requirements regarding colour of each of these other functions shall be fulfilled when the reciprocally incorporated function(s) and the front or rear position lamps are switched ON.