THE METHOD OF ACHIEVING THIS IS SET OUT IN FIGURE 3 OF THIS ANNEX, THE REFERENCE PLANE BEING A HARD, FLAT, LEVEL SURFACE ON WHICH THE VEHICLE STANDS, AND WHICH HAS TWO MEASURING SCALES FIRMLY FIXED TO ITS SURFACE; THESE SHALL BE GRADUATED IN MILLIMETRES, THE X-X SCALE BEING NOT LESS THAN 8 M LONG, AND THE Y-Y SCALE NOT LESS THAN 4 M LONG. THE TWO SCALES MUST BE SET AT RIGHT ANGLES TO EACH OTHER AS SHOWN IN FIGURE 3 OF THIS ANNEX.
Postopek za to je prikazan na sliki 3 v tej prilogi. Referenčna ravnina je trdna, gladka, ravna površina, na kateri stoji vozilo in na katere površini sta trdno pritrjeni dve milimetrski merilni skali, pri čemer skala x-x ne sme biti krajša od 8 m, skala y-y pa ne sme biti krajša od 4 m. Skali morata biti postavljeni pravokotno druga na drugo, kot je prikazano na sliki 3 te priloge.