Document ID: chunk:federal_register_of_legislation:F2015C00542:front:0:p7
Version: federal_register_of_legislation:F2015C00542
Segment Type: other
Provision Reference: 
Character Range: 21126–23884

in a way which is of significance to the function which it is intended to perform in a vehicle. The extent of such modification is assessed in relation to the indices of difficulty.
2.12. The term "indices of difficulty" covers a two-stage grading system applying to the variations observed in practice in each secondary characteristic. A change from index "1" to index "2" indicates the need for additional tests.
2.13. "Windscreen" means the glazing in front of the driver through which the driver views the road ahead.
2.14. "Developed area of windscreen" means the minimum rectangular area of glass from which a windscreen can be manufactured.
2.15. "Inclination angle of a windscreen" means the angle included between on the one hand a vertical line and on the other hand a straight line passing through the top and bottom edges of the windscreen, both lines being contained in a vertical plane containing the longitudinal axis of the vehicle;
2.15.1. Measurement of the inclination angle shall be performed on a vehicle standing on level ground, and in the case of a passenger-transport vehicle the vehicle shall be in running order, shall be fully charged with fuel coolant and lubricant, and shall be equipped with tools and the spare wheel or wheels (if they are provided as standard equipment by the vehicle manufacturer); allowance shall be made for the mass of the driver, and also, in the case of a passenger-transport vehicle, for that of one front-seat passenger, the mass of the driver and that of the passenger each being deemed to be 75 ± 1 kg;
2.15.2. Vehicles equipped with hydropneumatic, hydraulic or pneumatic suspension or with a device for automatic adjustment of ground clearance according to load shall be tested in the normal running conditions specified by the manufacturer.
2.16. "Group of windscreens" means a group comprising windscreens of differing sizes and shapes subjected to an examination of their mechanical properties, their mode of fragmentation and their behaviour in environmental-aggression resistance tests.
2.16.1. "Flat windscreen" means a windscreen exhibiting no normal curvature resulting in a height of segment greater than 10 mm per linear meter;
2.16.2. "Curved windscreen" means a windscreen exhibiting a normal curvature resulting in a height of segment greater than 10 mm per linear meter.
2.17. "Pane" means any single piece of glazing other than a windscreen;
2.17.1. "Curved pane" means a pane with a height of segment "h" greater than 10 mm per linear meter;
2.17.2. "Flat pane" means a pane with a height of segment equal to or less than 10 mm per linear meter.
2.18. "Height of segment 'h' " means the maximum distance, measured at right angles approximately to the glazing, separating the inner