The calculation of the surface of the impact area as well as the surface areas of 'bonnet top zone A' and 'bonnet top zone B' shall be done on the basis of a projected bonnet when viewed from a horizontal plane parallel to the horizontal zero plane above the vehicle, on the basis of the drawing data supplied by the manufacturer.
Površina preskusnega območja ter območij "A" in "B" zgornje površine prednjega pokrova se izračuna na podlagi projekcije pokrova motorja na vodoravno ravnino, vzporedno z ničelno vodoravno ravnino nad vozilom, na podlagi podatkov iz skice proizvajalca.