2.5. "Cab rear panel" means the rearmost part of the external surface of the driver and passenger compartment. Where it is not possible to determine the position of the rear cab panel, for the purposes of this Regulation it would be deemed to be the vertical transversal plane situated 50 cm to the rear of the "R" point of the driver seat, with the seat, if adjustable, located at its rearmost driving position (see Annex 3). However, the manufacturer may, with the agreement of the technical services, request an alternative distance if 50 cm can be shown as being inappropriate for a particular vehicle [2]; a1c0
2.5. "Cab rear panel" means the rearmost part of the external surface of the driver and passenger compartment. Where it is not possible to determine the position of the rear cab panel, for the purposes of this Regulation it would be deemed to be the vertical transversal plane situated 50 cm to the rear of the "R" point of the driver seat, with the seat, if adjustable, located at its rearmost driving position (see Annex 3). However, the manufacturer may, with the agreement of the technical services, request an alternative distance if 50 cm can be shown as being inappropriate for a particular vehicle [2]; a0c0