Document ID: chunk:federal_register_of_legislation:F2015C00542:reg:254:p15
Version: federal_register_of_legislation:F2015C00542
Segment Type: reg
Provision Reference: reg 254 (pt 15/18)
Character Range: 139119–142201

also in the reduced test area B according to paragraph 2.4. of Annex 18 for N1 vehicles.

              9.2.2.3. For agricultural and forestry tractors and for construction-site vehicles for which it is not possible to determine zone I, in zone I' as defined in paragraph 9.2.5.3. of this annex.

              9.2.2.4. Vehicle type

               The test shall be repeated if the windscreen is to be fitted to a vehicle of a type in which the forward field of vision differs from that of the vehicle type for which the windscreen has already been approved.

              9.2.3. Indices of difficulty of the secondary characteristics

              9.2.3.1. Nature of the material

               Polished (plate) glass Float glass Sheet glass

                1 1  2

              9.2.3.2. Other secondary characteristics

               No other secondary characteristics are involved.

              9.2.4. Number of windscreens

               Four test pieces shall be submitted for testing.

              9.2.5. Definitions of zones

              9.2.5.1. Zones A and B of windscreens for vehicle category M1 and N1 are defined in Annex 18 to this Regulation.

              9.2.5.2. Zones of windscreens for vehicles of categories M and N other than M1 are defined on the basis of:

              9.2.5.2.1. The "eye-point" or the "O" point" means the point located 625 mm above the R point of the driver's seat in the vertical plane parallel to the longitudinal median plane of the vehicle for which the windscreen is intended, passing through the axis of the steering wheel.

              9.2.5.2.2. The straight line OQ which is the horizontal straight line passing through the eye point 0 and perpendicular to the median longitudinal plane of the vehicle.

              9.2.5.2.3. Zone I is the windscreen zone determined by the intersection of the windscreen with the four planes defined below:

                   Pl - A vertical plane passing through 0 and forming an angle of 15° to the left of the median longitudinal plane of the vehicle;

                   P2 - A vertical plane symmetrical to Pl about the median longitudinal plane of the vehicle.

               If this is not possible (in the absence of a symmetrical median longitudinal plane, for instance) P2 shall be the plane symmetrical to Pl about the longitudinal plane of the vehicle passing through point 0.

                   P3 - A plane passing through the straight line OQ and forming an angle of 10° above the horizontal plane;

                   P4 - A plane passing through the straight line OQ and forming an angle of 8° below the horizontal plane.

              9.2.5.3. For agricultural and forestry tractors and for construction-site vehicles for which it is not possible to determine zone I, zone I' consists in the whole surface of the windscreen.

              9.2.6. Interpretation of results

              A windscreen type shall be considered satisfactory with respect to optical distortion if, in the four windscreens submitted for testing, optical distortion does not