Document ID: chunk:federal_register_of_legislation:F2018L01521:front:0:p8
Version: federal_register_of_legislation:F2018L01521
Segment Type: other
Provision Reference: 
Character Range: 23048–26056

edge of section S2 and the tangent joining E2 to the inner edge of section S1 (see Annex 4, Appendix, Figure 3).
              5.1.2.1.2. The angle of obstruction of the "A" pillar on the passenger side is the angle formed on the plane view by the tangent joining E3 to the inner edge of section S1 and a parallel, starting from E3, to the tangent joining E4 to the outer edge of section S2 (see Annex 4, Appendix, Figure 3).
         5.1.2.2. No vehicle shall have more than two "A" pillars.
              5.1.3.  Except as provided in paragraph 5.1.3.3. or 5.1.3.4. below, other than the obstructions created by the "A" pillars, the fixed or movable vent or side window division bars, outside radio aerials, devices for indirect vision, covering the mandatory field of indirect vision, and windscreen wipers, there shall be no obstruction in the driver's 180° forward direct field of vision below a horizontal plane passing through V1, and above three planes through V2, one being perpendicular to the plane X‑Z and declining forward 4° below the horizontal, and the other two being perpendicular to the plane Y‑Z and declining 4° below the horizontal (see Annex 4, Appendix, Figure 4).
           The following are not considered to be obstructions to the field of vision:

                  (a)  Embedded or printed "radio aerial" conductors, no wider than the following:

              (i) Embedded conductors: 0.5 mm,

                     (ii) Printed conductors: 1.0 mm. These "radio aerial" conductors shall not cross zone A[5]. However, three "radio aerial" conductors may cross zone A if their width does not exceed 0.5 mm.

                  (b) Within zone A located "defrosting/demisting" normally in "zigzag" or sinusoidal form having the following dimensions:

              (i) Maximum visible width: 0.030 mm,

              (ii) Maximum conductor density:

              a. If the conductors are vertical: 8/cm,

           b. If the conductors are horizontal: 5/cm.

5.1.3.1.  In case of camera monitor devices, the exemptions of paragraph 5.1.3. apply to cameras including their holders and housings which are mounted to the vehicle exterior. The camera-monitor system replacing a rear-view Class I mirror shall have the same exemption.
5.1.3.2.  For vehicles, which are equipped as standard with approved rear-view mirrors that are optionally replaced by camera-monitor devices, the exemptions of paragraph 5.1.3. apply also to monitors, provided:[6]
                  (a) Their obstruction of the direct view does not exceed the level of obstruction of the corresponding exterior rear-view mirror including its housing and holder, and;
                  (b) The position of the monitor is as close as practicable to the position of the rear-view mirror it replaces.

              5.1.3.3. An obstruction created by the steering-wheel rim and the instrument panel inside the steering wheel will be tolerated if a plane through V2, perpendicular to the plane x - z and tangential to the