Document ID: chunk:federal_register_of_legislation:F2023L01006:reg:780:p5
Version: federal_register_of_legislation:F2023L01006
Segment Type: reg
Provision Reference: reg 780 (pt 5/8)
Character Range: 88902–91635

the actual distance from the rotated eye midpoint location (Mr) to the centre of the rear-view image. Define this viewing distance as aeye.
         3.5. Calculate visual angle subtended by test objects.
         Use the following equation to calculate the subtended visual angles:
         where i can take on the value of either test object G, H, or I, and arcsine is calculated in units of degrees.

Figure C
Eye Midpoint location (Mf) in the mid-sagittal plane with respect to R point for forward-looking 50th percentile male driver seated with 25 degree seat back angle

Annex 10
 Test methods for detection systems
         1. Rear horizontal area detection
         The detection systems shall fulfil the test as specified in paragraph 1.3.1. in this Annex. However, if the detection systems fulfil the test as specified in paragraph 1.4. in this annex, the test as specified in paragraph 1.3.1. in this annex shall be considered to be satisfied.
         1.1. Test conditions
         The test object shall be as per paragraph 7.1. of ISO 17386:2010. During testing, the wind speed shall not exceed 1 m/s. The temperature shall be 20  5C and the humidity shall be 60  25 percent. There shall be no rain or snow. The test shall be performed on a flat, dry asphalt or concrete surface. The test shall not be affected by the reflection of sound waves or electromagnetic waves from any walls, auxiliary testing equipment or any other objects in the environment.
         1.2. Test preparation
         One test object shall be used. The distance from the rear edge to the test object and the position of the test object are selected by the manufacturer to ensure the detection of the test object. The test object shall be located in the detectable grids within the rear horizontal area in 1.3.1. of this annex. The test vehicle in the initial state shall be with the detection system in the activated state, which is declared [by the manufacturer OR in the owner's manual] and shall be in the parking condition. Here, the parking condition means that the P (park) position is selected in the case of vehicles equipped with automatic transmissions, whereas it means the neutral gear being selected and the parking brake being engaged in the case of vehicles equipped with manual transmissions.
         1.3. Test method
         1.3.1. Field of detection
         The maximum detection distance in paragraphs 5.4.2. and 5.4.3. of ISO 17386:2010 shall be 1.0 m (Class R2). The width of the rectangle, w_r, is equal to the vehicle width, measured along the rear axle. The dimensions shall be rounded up to the nearest 0,1 m. The figure below gives examples of different w_r. (Figure 1 and 2).
Figure 1
In the case of odd-numbered