Document ID: chunk:federal_register_of_legislation:F2023C00919:body:0:p69
Version: federal_register_of_legislation:F2023C00919
Segment Type: other
Provision Reference: 
Character Range: 204821–207736

rear.
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°.
6.17.6.                          Orientation
Towards the side.
6.17.7.                          Other requirements
The illuminating surface of the side retro reflector may have parts in common with the apparent surface of any other side lamp.
6.18.                                Side marker lamps (Regulation No. 91)
6.18.1.                          Presence
Mandatory: On all vehicles, the length of which exceeds 6 m, except for chassis cabs.
The SM1 type of side marker lamp shall be used on all categories of vehicles; however, the SM2 type of side marker lamps may be used on the M1 category of vehicles.
In addition, on M1 and N1 category vehicles less than 6 m in length, side-marker lamps shall be used, if they supplement the reduced geometric visibility requirements of front position lamps conforming to paragraph 6.9.5.2. and rear position lamps conforming to paragraph 6.10.5.2.
Optional: On all other vehicles.
The SM1 or SM2 types of side marker lamps may be used.
6.18.2.                          Minimum number per side
Such that the rules for longitudinal positioning are complied with.
6.18.3.                          Arrangement
No individual specifications.
6.18.4.                          Position
6.18.4.1.                    In width: no individual specifications.
6.18.4.2.                    In height: Above the ground, not less than 250 mm nor more than 1,500 mm (2,100 mm if the shape of the bodywork makes it impossible to keep within 1,500 mm).
6.18.4.3.                    In length: at least one side-marker lamp shall be fitted to the middle third of the vehicle, the foremost side-marker lamp being not further than 3 m from the front.  The distance between two adjacent side-marker lamps shall not exceed 3 m. If the structure, design or the operational use of the vehicle make it impossible to comply with such a requirement, this distance may be increased to 4 m.
The distance between the rearmost side-marker lamp and the rear of the vehicle shall not exceed 1 m.
However, for vehicles, the length of which does not exceed 6 m and for chassis-cabs, it is sufficient to have one side-marker lamp fitted within the first third and/or within the last third of the vehicle length.  For M1 vehicles the length of which exceeds 6 m but does not exceed 7 m it is sufficient to have one side-marker lamp fitted not further than 3 m from the front and one within the last third of the vehicle length.
6.18.5.                          Geometric visibility
Horizontal angle: 45° to the front and to the rear; however, for vehicles on which the installation of the side-marker lamps is optional this value can be reduced to 30°.
If the vehicle is equipped