Document ID: chunk:federal_register_of_legislation:F2023C00919:body:0:p70
Version: federal_register_of_legislation:F2023C00919
Segment Type: other
Provision Reference: 
Character Range: 207469–210553

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 with side-marker lamps used to supplement the reduced geometric visibility of front and rear direction indicator lamps conforming to paragraph 6.5.5.2. above and/or position lamps conforming to paragraphs 6.9.5.2. and 6.10.5.2. above, the angles are 45° towards the front and rear ends of the vehicle and 30° towards the centre of the vehicle (see the figure in paragraph 6.5.5.2. above).
Vertical angle: 10° above and below the horizontal. However, where a lamp 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°.
6.18.6.                          Orientation
Towards the side.
6.18.7.                          Electrical connections
On M1 and N1 category vehicles, less than 6 m in length amber side-marker lamps may be wired to flash, provided that this flashing is in phase and at the same frequency with the direction-indicator lamps at the same side of the vehicle.
On M2, M3, N2, N3, O3 and O4 vehicles, mandatory amber side marker lamps may flash simultaneously with the direction-indicator lamps on the same side of the vehicle. However, where there are direction indicator lamps of category 5 installed according to paragraph 6.5.3.1. on the side of the vehicle these amber side marker lamps shall not flash.
6.18.8.                          Tell tale
Tell-tale optional. If it exists its function shall be carried out by the tell-tale required for the front and rear position lamps.
6.18.9.                          Other requirements
When the rearmost side-marker lamp is combined with the rear position lamp reciprocally incorporated with the rear fog-lamp or stop lamp, the photometric characteristics of the side-marker lamp may be modified during the illumination of the rear fog lamp or stop lamp.
Rear side-marker lamps shall be amber if they flash with the rear direction-indicator lamp.
6.19.                                Day-time running lamp (Regulation No. 87)[15]
6.19.1.                          Presence
Mandatory on motor vehicles. Prohibited on trailers.
6.19.2.                          Number
Two.
6.19.3.                          Arrangement
No special requirement.
6.19.4.                          Position
6.19.4.1.                    In width: the distance between the inner edges of the apparent surfaces in the direction of the reference axes shall not be 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.
6.19.4.2.                    In height: above the ground not less than 250 mm nor more than 1,500 mm.
6.19.4.3.                    In length: at the front of the vehicle. This requirement shall be deemed to be satisfied if the light emitted does not cause discomfort to the driver either directly or indirectly through