Document ID: chunk:federal_register_of_legislation:F2018L01521:front:0:p4
Version: federal_register_of_legislation:F2018L01521
Segment Type: other
Provision Reference: 
Character Range: 12318–15274

1.2.  Its purpose is to ensure an adequate field of vision when the windscreen and other glazed surfaces are dry and clean.
              1.3.  The requirements of this Regulation are so worded as to apply to category M1 vehicles in which the driver is on the left. In category M1 vehicles in which the driver is on the right these requirements shall be applied by inverting the criteria, when appropriate.
2.  Definitions for the purpose of this Regulation
              2.1.  "Approval of a vehicle type" means the full procedure whereby a Contracting Party to the Agreement certifies that a vehicle type meets the technical requirements of this Regulation.
              2.2.  "Vehicle type with regard to the field of vision" means vehicles which do not differ in such essential aspects as:
              2.2.1.  The external and internal forms and arrangements within the area specified in paragraph 1. above which may affect visibility; and
         2.2.2.  The shape and dimensions of the windscreen and its mounting.
              2.3.  "Three‑dimensional reference grid" means a reference system which consists of a vertical longitudinal plane X‑Z, a horizontal plane X‑Y and a vertical transverse plane Y‑Z (see Annex 4, Appendix, Figure 6); the grid is used to determine the dimensional relationships between the position of design points on drawings and their positions on the actual vehicle. The procedure for situating the vehicle relative to the grid is specified in Annex 4; all coordinates referred to ground zero shall be based on a vehicle in running order[2] plus one front-seat passenger, the mass of the passenger being 75 kg ±1 per cent.
              2.3.1.  Vehicles fitted with suspension enabling their ground clearance to be adjusted shall be tested under the normal conditions of use specified by the vehicle manufacturer.
              2.4.  "Primary reference marks" means holes, surfaces, marks and identification signs on the vehicle body. The type of reference mark used and the position of each mark relative to the X, Y and Z coordinates of the three‑dimensional reference grid and to a design ground plane shall be specified by the vehicle manufacturer. These marks may be the control points used for body‑assembly purposes.
              2.5.  "Seat‑back angle" means the angle defined in the revised Consolidated Resolution on the Construction of Vehicles (R.E.3)[3], Annex 1, paragraph 2.6. or 2.7.
              2.6.  "Actual seat‑back angle" means the angle defined in the revised R.E.3, Annex 1, paragraph 2.6.
              2.7.  "Design seat‑back angle" means the angle defined in the revised R.E.3, Annex 1, paragraph 2.7.
              2.8.  "V points" means points whose position in the passenger compartment is determined as a function of vertical longitudinal planes passing through the centres of the outermost designated seating positions on the front seat and in relation to the "R" point and the design