Document ID: chunk:federal_register_of_legislation:F2023C00919:body:0:p67
Version: federal_register_of_legislation:F2023C00919
Segment Type: other
Provision Reference: 
Character Range: 199326–202494

may have parts in common with the apparent surface of any other lamp situated at the rear.
6.16.                                Front retro reflector, non-triangular (Regulation No. 3)
6.16.1.                          Presence
Mandatory on trailers.
Mandatory on motor vehicles having all forward facing lamps with reflectors concealable.
Optional on other motor vehicles.
6.16.2.                          Number
Two, the performances of which shall conform to the requirements concerning Class IA or IB retro reflectors in Regulation No. 3. Additional retro reflecting devices and materials (including two retro-reflectors not complying with paragraph 6.16.4. below), are permitted provided they do not impair the effectiveness of the mandatory lighting and light-signalling devices.
6.16.3.                          Arrangement
No special requirement.
6.16.4.                          Position
6.16.4.1.                    In width: that point on the illuminating surface, which is farthest from the vehicle's median longitudinal plane, shall not be more than 400 mm from the extreme outer edge of the vehicle.
In the case of a trailer, the point of the illuminating surface, which is farthest from the vehicle's median longitudinal plane, shall not be farther than 150 mm from the extreme outer edge of the vehicle.
The distance between the inner edges of the two apparent surfaces in the direction of the reference axes shall:
For M1 and N1 category vehicles: have no special requirement;
For all other categories of vehicles: be not less than 600 mm. This distance may be reduced to 400 mm where the overall width of the vehicle is less than 1,300 mm.
6.16.4.2.                    In height: above the ground, not less than 250 mm nor more than 900 mm (1,500 mm if the shape of the bodywork makes it impossible to keep within 900 mm).
6.16.4.3.                    In length: at the front of the vehicle.
6.16.5.                          Geometric visibility
Horizontal angle: 30° inwards and outwards. In the case of trailers, the angle inwards may be reduced to 10°. If because of the construction of the trailers this angle cannot be met by the mandatory retro-reflectors, then additional (supplementary) retro-reflectors shall be fitted, without the width limitation (paragraph 6.16.4.1. above), which shall, in conjunction with the mandatory retro-reflectors, give the necessary visibility angle.
Vertical angle: 10° above and below the horizontal. However, where a retro-reflector is mounted below 750 mm (measured according to the provisions of paragraph 5.8.1. above), the downward angle of 10° may be reduced to 5°.
6.16.6.                          Orientation
Towards the front.
6.16.7.                          Other requirements
The illuminating surface of the retro reflector may have parts in common with the apparent surface of any other lamp situated at the front.
6.17.                                Side retro reflector, non-triangular (Regulation No. 3)
6.17.1.                          Presence
Mandatory: On all motor vehicles the length of which exceeds 6 m.
On all trailers.
Optional: On motor vehicles the length of which does not exceed 6